Preface:

I grew up in Trinidad, an island in the West Indies were there was a significant number of homeless individuals living on the streets. So much so that they were a constant presence in the more urban areas of the island. As varied as they were in age and in circumstances which lead them to a life on the street, there was one striking physical aspect that they all shared- namely that almost every one of them had a remarkably defined six pack. They weren’t the only group of people who seemed somehow blessed with rippling midsections as those who chose to live off the land in the hills as a rule were similarly blessed with deeply etched abdominals. These people had never done a sit up, didn’t know what a crunch was, never used an Abdominizer or any other newfangled ab machine nor did they even know what a fat burner was. Perhaps, like the native people of everywhere from Papua, New Guinea to the Amazon Basin they didn’t realize that these things were a prerequisite to having a six pack. Or perhaps most of what you read about getting a six pack has little to do with actually achieving it.  In this updated article, I do my best to discount the myths surrounding getting a six pack- most of which revolve on making you buy a product or service of some sort or promote unhealthy eating practices that create temporary solutions at best. I will preface the article with a caveat that what it takes to get a six pack isn’t impossible nor does it have to cost you anything- but it does require commitment, dedication and time. Thanks as always for reading.

Six Pack Abs-Why What You Eat & How Much You Eat Is More Important Than The Exercises

Over the past two decades of my career as both a personal trainer and a natural bodybuilder the most common question that I have been asked is how do you go about getting a six pack. You can get many different answers from many different people but I have always found it interesting that many of the self appointed fitness gurus giving the advice don’t sport a six pack themselves. Some may have a picture or two of what they looked like when they did have a six pack, but the photos are usually pretty dated or document the way they looked for a very brief period of time when preparing for a bodybuilding contest or photo shoot. As great an accomplishment as this may be, it in no way reflects what they look like all year round and few members of the general public are interested in only having a six pack for two or three weeks out of the year. The popular ninety day extreme exercise and diet video series promise a six pack within a very short time period, but as those who have done such programs can attest- you’ll regain the weight and lose whatever semblance of a six pack you gained within an equally short period of time.

The widespread use of steroids, thyroid medications, insulin, human growth hormone and other such drugs also makes it hard to find credible role models. Non natural bodybuilders, fitness models, figure competitors, bikini competitors, celebrities and many personal trainers rely on drugs for their coveted washboard midsections and it is disturbing to note the number of recreational users who risk their health with these drugs simply to look good for the summer. It is a sad blow to the fitness industry as it creates a culture of trainers who have no experience getting into shape without using drugs and thus are unable to help anyone else do the same. Add to this the babel of infomercials hawking the latest ‘scientifically proven’ ab machines and exercises and you can easily find yourself lost, confused and someone lighter in the wallet in your quest to see your abdominal muscles. That being said, it is very possible to have a six pack and keep it all year round, regardless of body type but it does take work and it won’t happen overnight.

Six Pack Abs As An Effective Marketing Tool

The allure of six pack abs is a powerful tool for getting you to buy everything from supplements to exercise machinesstuff

You turn on the television and something in you wants to believe them. The well sculpted models using some new fangled invention that they swear will get you a six pack within a matter of weeks. Perhaps summer is coming or you are just tired of not seeing what you want in the mirror and so you buy the machine, using it faithfully just as they did on the infomercials- and yet nothing happens. Your belly remains just that- a belly. It doesn’t transform into a chiseled work of art and you can’t understand why. Undaunted, but a bit lighter in the purse, you go to the gym. You just want to get your abdominals looking sharp and all the gym advertisements are filled with beautifully built people with the midsections of a Greek gods. Given how great they look, it should only be a matter of time until that membership pays off and you’ll look just like them. You do everything you read about- thousands of crunches, sit ups and leg raises. You hit every ab machine in the gym every day you are there, take every ab class and put in your time doing cardio to burn off the fat. At first you fell that you are making progress, you feel the burn when you train and are confident that the six pack of your dreams are just around the bend. But nothing happens. All that has happened is that you have spent good money on machines you don’t use and a gym membership that is becoming more and more of a reminder of how hopeless your quest has become.

The weeks turn into months and the months turn into years, and still those blocks in your stomach remain elusive. So you decide to do more. You train longer and you do more exercises for your abdominal muscles, perhaps training them every day. Maybe even twice a day, yet your midsection still looks more like a spare tire rather than a carved piece of granite. What could be the problem? Why can’t you get the same abdominal definition as the people in the magazines? Why is there still a layer of fat where rippling muscles should be after all of your hard work? The answer has nothing to do with six packs and everything to do with economics.

Unless you were one of the fortunate few who had an accomplished mentor to steer you in the right direction from day one, you probably got most of your information on getting a six pack from television, books, magazines, or the Internet. However it is important to reflect on what these sources have to gain by your heeding their advice. From the eye catching before and after pictures to the authoritative pitches by celebrities and fitness gurus there is usually one common denominator behind it all and that is profit.

6 Pack Abs Are A Multi-Million Dollar Industry

The quest for six pack abs make people throw away significant sums of money on things that don't work or provide only fleeting results.

There is a very useful Latin phrase, ‘cui bono?’ which translates as ‘who stands to gain?’ – and this is precisely the question you should be asking when confronted by any information on how to get your abs to show. There are always new and improved machines and new and improved exercise programs, all sold by well muscled trainers, athletes and celebrities and there will always be new ones coming out of the woodwork. The math is pretty simple- these programs, routines, exercises, extreme diets and classes aren’t going to produce an army of six pack sporting citizens, but rather a slew of frustrated individuals. Individuals who are not going to lay the blame on the machine/diet/DVD or trainer for failing, but who instead will place the blame squarely on themselves. Disheartened and filled with a sense of failure, they thus become the perfect consumers for another round of products and services- in the hope that this one will finally help them break through and get them a six pack. It is a cyclic system that sells you hope but not much of anything else and it works as long as the general public remains confused and unsure about what they need to do to get into shape.

Today in our society people want results and they want it now- a microwave mentality that applies not only to how people approach matters of health and fitness, but also just about every facet of modern life. If people want something, they want it now and you are willing to pay for it, a weakness that the fitness industry and media use to their advantage. People will always buy that fitness magazine because they are certain that if you do the same ‘secret exercises’ that the celebrity/athlete/model/bodybuilder is doing, you will eventually look like them.

People will always tune in to that special report on the new way to lose inches off of your midsection. News programs have devolved mostly into thinly disguised forms of entertainment, where ratings take precedence over the reporting of credible information, ratings that help them sell advertisement time at higher prices, which thus net the networks higher profits. In the final analysis, most of the information you come across about getting a six pack comes with a vested interest in making a profit and not some altruistic and compassionate desire to help you realize your goal. Unfortunately you can’t make much in the way of profit with the principles that are really needed to get a six pack. There is no instant gratification and it doesn’t come with a need for fancy machines, DVDs, supplements, books or magazines. Most importantly, you can do it without spending the better part of your life doing abdominal exercises.

The Reality Of  Six Pack Abs- Proper Diet & Exercise

Everyone already has a six pack, it's simply a matter of reducing bodyfat to a point where it can be seen.

So how do you get abs? Well, for starters you already have them. Like the story of the fish that spends it’s life searching for water, most of us fail to realize that every human being already has a six pack- whether you can see them prominently or not. There are four main abdominal muscles, the transversus abdominus – which is the deepest muscle layer and it works to help stabilize the trunk and maintain internal abdominal pressure. The rectus abdominus – slung between the ribs and the pubic bone at the front of the pelvis. This muscle has the characteristic bumps and bulges that are commonly referred to as ‘the six pack’ and everyone has them. There is also the external oblique muscles which flank the rectus abdominus and allow the trunk to twist and then there are the internal oblique muscles which also flank the rectus abdominus and operate in the opposite way to the external oblique muscles.

So if everyone has these abdominal muscles, one might ask why some have a six pack that you can see and others do not- the answer is simply a matter of body fat. Most men have a body fat percentage of around 15% to 18% and most women have an average body fat level of about 22% to 25%. Now even at these levels (which are  quite low for most of the general population) most people would have a layer of fat around their midsection that would hide their abdominal muscles. The muscles are always there, and all you really need to do is to reduce your body fat to levels where you can see them. Athletes typically have lower body fat percentages due to their increased activity levels.

Where your fat stores are and how high your body fat percentage is will determine how long it will take you to have a six pack. Some people with relatively high body fat percentages but with naturally low fat deposits in the stomach area can have a fairly visible six packs, while others need to reduce their body fat percentages to the single digits before they can see theirs. So how do you go about reducing your body fat in a way that doesn’t yield only fleeting results? The natural way to do it is simply a combination of:
PROPER DIET, HIGH INTENSITY WEIGHT TRAINING AND TIME.

This six pack wasn't built overnight and it took serious weight training to acheive it.

That’s one tried and true way of doing it and one that I have seen work without fail. No magic machines, no magic pills, no DVD’s and most certainly no special exercises or even cardio. I can say so with some authority since for the past 23 years I haven’t done that much in the way of  crunches, sit ups and the like after my tenth year and I never did any cardio- nor did any of my clients. When I did train my abs in the early years of my career it was never more than two exercises for a total of six sets, which took no more than three to five minutes to complete. As a natural bodybuilder I was told very early on that you rely on diet only to get into shape and not cardio- as too much in the way of muscle mass is always lost in the process and because it doesn’t really work. (Read more about cardio as an ineffective method for fat loss here.) In fact during the height of my bodybuilding career I didn’t do anything for my abs and still won shows and almost every photograph of me in circulation is what I look like having not done any direct ab work for over a decade. I’m not a genetic freak by any stretch, I never used drugs, nor am I possessed of a special body type that allows me to get away with doing so little as I have been able to replicate the same results with my clients who competed successfully in fitness, figure and bodybuilding competitions- regardless of their initial body type- and without doing any cardio or hours of ab exercises. It’s not what the fitness industry wants you to hear, but it’s the truth and isn’t thanks to anything but a consistently clean diet and intense weight training.

Everyone Has Six Pack Abs- Somewhere

In my workout DVD which was filmed to document my training philosophy and show what you could do without having to resort to drugs or supplements, there are no shots of me training my abdominals. I was asked on many occasions why I didn’t include a segment on abdominal training and the reason that I didn’t is because I did not in any way want to mislead the public.  Throughout my career I have strived to be as honest and upfront as possible (sometimes to my detriment one might add) and the last thing that I wanted was for people to think that if they trained their abs the way I did that they would get similar results as nothing could be further from the truth. It’s a combination of my years of careful attention to what and how much I eat, the fat burning effect of the brief high intensity training routine that I have followed religiously for the past 21 years and the metabolically active muscle mass that I have gained over my 23 years of training. That’s what keeps me in shape all year round and nothing else.

If It Won’t Give Me Six Pack Abs Do You Need To Do Ab Exercises?

Do you need abdominal exercises for a six pack? Not exactly, but you should do them anyway.

Now make no mistake- there is indeed a need to train your abdominal muscles- as it helps stabilize your entire body and such exercises are indeed recommended for everyone starting a training routine. However, your abdominal muscles get a serious workout during almost any weight training exercise and very much so if you train as hard and as heavy as I do at this point in my career using primarily compound movements. Thus I don’t need to do much in the way of direct ab exercises as they are hit pretty hard as a result of my high intensity training routine. That being said, your abdominals are muscles like anything else and training them every day with hundreds of repetitions won’t do much in terms of getting them to be as strong as possible and can result in overdevelopment. Take a look at the bodybuilders who have blocky abdominal muscles as a result of years of weighted abdominal exercises and or drug use. It might look impressive when they flex them, but otherwise those muscles protrude and give a rather pot bellied appearance. Big and thick abs don’t look too great in a T-shirt, and doesn’t present much in the way of a balanced and aesthetically pleasing physique.
The problem is that once you over develop your abdominal muscles by doing too much, it isn’t that easy- if at all possible to reverse it and you are stuck with a thick waist- which I doubt is the goal of those who train their abs day in and day out. Now the muscle tension created by training your abs several times a week makes you FEEL like your abs are tighter- but like any muscle the more you train them won’t necessarily make them any stronger or better developed. If anything it can actually hinder your overall progress (read more about how muscles get stronger here). As for ‘core strength’- time spent on an exercise ball will never give you the strength you can gain from a high intensity training program. High intensity weight training can make your core muscles strong enough to enable you to lift a car- which is a far cry from what you could do on your best day if you relied only on the modern incarnation of ‘core exercises.’ It won’t give you a six pack either.

Six Pack Abs Comes From Diet & Exercise

Now training your abdominal muscles can help make them bigger- but it can’t burn off the layer of fat that obscures them. That comes from a clean diet and ensuring that you don’t overeat. Any exercise claiming that it can spot reduce the fat around your stomach is as credible as killing chickens and painting yourself blue under a full moon to make it rain the next day. Muscle and fat are two completely different types of tissue thus an abdominal exercise will do nothing to reduce your waistline.

One or no more than two abdominal exercises done once a week at reasonable intensity is more than enough for 99% of the general population. Nevertheless, you can do ab  exercises until the cows come home but  it won’t do anything if your diet isn’t on point. I would honestly say that diet is 80% of the equation if your goal of a six pack. How you train creates the potential for your body to change but it’s what you eat that will determine how much you will change.

The Importance Of Diet For Six Pack Abs

What type of diet do you need to follow if a six pack is your ultimate goal? It’s a diet consisting exclusively of foods that have been part of the human diet for the past 150,000 years and one where you don’t overeat. That means no processed foods, (and that includes protein shakes- which you should avoid if you seriously want a six pack- read my article here) no added salt or sugars, no alcohol, juices or junk food of any kind. It isn’t as Spartan as one might think as it is absurd to believe that you need processed foods and alcohol to enjoy life. Humans have done it for millennia and back then most of them had that same six pack that today so many struggle to attain. Your great-great grandparents enjoyed their food, and most likely ate far less than you do today. It didn’t kill them, but on the contrary probably allowed them a better quality of life in terms of robust health.

In terms of exercise- you need to also incorporate weight training of a sufficient intensity to both increase your muscle mass which will also help you burn off the excess body fat in a manner that leads to sustainable and lasting results. So forget about doing high reps in the hopes of doing anything but wasting your time. For your body to change their must be some degree of overload and you can learn more about how this mechanism works in my article here.

Now paying attention to your diet over a long period of time in combination with a sensible exercise regiment isn’t going to give you any instant gratification. Attention to diet requires a lifetime of consideration, patience and discipline. Traits that don’t lend themselves to today’s microwave mentality but are nonetheless very much what it takes to get in shape and stay in shape. After all, it’s only logical that if it took you years to put on that layer of fat that obscures your stomach, it wouldn’t be realistic to expect it to go away in a couple of weeks. There are legitimate reasons to work your abdominal muscles directly, and that is to strengthen the muscles that support the trunk and allow for movement. These muscles also help support your lower back, so training them is not just a cosmetic undertaking. I hope this article help clear up some of the misconceptions around abdominal training, and I wish you all the best in your quest for six pack abs!

Get a copy of Kevin’s free weight loss ebook here!

Related Articles

Should Women Weight Train Like Men

Does Aerobics Work- Rethinking The Need For Cardio

How Muscles Get Bigger & Stronger

How To Build Your Lower Abs

High Intensity Workouts & Fat Loss

Kevin Richardson is an award winning fitness writer, one of the most sought after personal trainers in New York City and the creator of Naturally Intense High Intensity Training^TM. If you live in the New York City metropolitan area and need help losing weight or getting into cover model shape, give Kevin and his team a call at 1-800-798-8420.

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How much do you know about health and fitness?

Take our quiz based on our blog articles, daily Twitter & Facebook health tips and see where you stand. Good luck!

Quizzes by Quibblo.com | SnapApp Quiz Apps

How Did You Do?
90 to 100%- You are a tried and true expert in all things related to health and fitness.
70 to 89%- You know your stuff, but could do with a little brushing up on your diet and exercise knowledge.
50% to 69%- You passed, but just barely. Lot’s of catching up to do.
49% or less- You didn’t pass, but don’t despair, keep reading our blogs and articles and be sure to follow Kevin on Twitter for daily fitness updates and you’ll be up to scratch in no time!

The answers:

1. Someone who is overweight has a slower metabolism than someone with a healthy body weight.

False- The heavier you are the faster your metabolism will be- read more here

2. An apple really has 70,000 calories.

True. Strictly speaking an apple has 70,000 calories- since the energy content of food is measured in kilocalories which is one thousand calories. Confused? Read my article on understanding calories here.

3. If you follow a proper diet you can lose 10 lbs of fat in 1 week.

False- it’s mathematically  impossible if you are eating any food at all to lose that much fat in a week given the fact that you need to expend 36000 kcals for every 1 pound of fat. Read more here.

4. As little as 40 kilocalories over your daily energy requirements can lead to a weight gain of over 40 lbs in ten years.

Sad but true. A small intake over what your body really needs creates the silent, cumulative weight gain that seems to sneak up on you over the years – read more here.

5. Regular Snapple juices have less sugar than Coca Cola

False. Regular Snapple drinks have more sugar than an equal amount of Coca Cola even though it is marketed as a healthier alternative to sodas. Check out Kevin’s Twitter and Facebook updates for daily health tips!

6. When eating at a restaurant anything labeled ‘Crispy’ is fine to eat as a healthier choice.

False. The word ‘crispy’ is code for fried. Read more in our guide to healthy restaurant eating here.

7. Oats contain gluten.

False, pure oats do not contain gluten proteins. Read more on oats and gluten here.

8. Cane sugar is healthier than corn syrup.

False, several notable health organizations have affirmed that there is no distinction that should be made between the two in terms of health risk when consumption is immoderate. Read more here.

9. Weight training can’t protect you from bone loss over time.

False. It does and you can read more about the mechanisms of increasing bone density through resistance exercise here.

10. Feeling guilty after eating junk food can help you not eat it again.

False. The more you think about a food you ate the more likely you are to continue eating it. Read more about how guilt can sabotage your diet here.

11. Multi-vitamins have been conclusively proven to make you healthier.

False. Every study on the matter has found no health benefit to those without significant vitamin deficiencies (which contrary to popular belief if almost non-existent in developed countries). Read more about it here.

12. Soil today has 50% less of the nutrients it had 50 years ago and so do the fruits and vegetables grown in them.

False. While there is some reduction in soil nutrients over time, the amounts found in produce isn’t significantly lower, nor does it justify the use of vitamin supplementation. Read more here.

13. When you buy fruits and vegetables the growers get get as much as 50-60% of the profits.

False. Farmers get as little as 4% of the profit at times for produce- a figure that is far higher for those who raise animal stocks. That’s one of the reasons fruits and vegetables aren’t promoted as much as meat and high profit junk foods- the profit margins are simply too low. Read more about the economics behind the food that you eat here.

14. It is the interest of the US economy for you to eat more of the foods that aren’t good for you.

True. The food industry not only generates over 8% of the U.S. GDP with a trillion dollars in annual sales, but it also employs 12% of working Americans. Given these figures it isn’t surprising that government programs are in place to support their marketing  strategies to get you to eat more. Read more here.

15. Eating foods with added Omega 3 fats can improve your health.

False. Studies have shown this to not all be the case. Read more on how adding omega 3 fats to products do little to help anything but profit margins here.

16. Fasting is a great way to detoxify your body.

False and the only way to give your body a break from foods you believe to be toxic is to not eat those foods in the first place. Read more here on fasting and what it can and cannot do.

17. Aerobic exercise is essential for building endurance, losing body fat and working your heart.

False. It’s not the only way as studies have shown that you can increase endurance, lose body fat and get a significant improvement in cardiovascular efficiency from high intensity resistance training alone. Read how you can get fit in less time here.

18. Early man did not eat bread during the Paleolithic era and thus it is not a natural part of our diet.

False. Recent archeological digs in Italy, Russia and the Czech Republic have revealed the use of flat breads dating back as far as 30,000 years ago into what is commonly called the Paleolithic era. Read more about bread and its role in weight gain here.

19. Protein shakes are just as good as solid foods for your protein needs.

False. Contrary to marketing that masquerades as science, protein shakes are not only unnatural and highly processed products, but they can actually make you gain body fat. Read more here.

20. Tongol tuna is a better choice because it has lower mercury levels than regular tuna.

True. It’s a smaller fish and thus is lower in methyl-mercury. Read more about tongol tuna here.

21. The longer and more often you train the bigger and stronger your muscles will become.

False. Without continued overload to the point that stimulates an adaptive response, after becoming accustomed to the stimulus your muscles will have no reason to get bigger or stronger. It’s not always how much you do, it’s how you do it. Read more about how muscles get bigger and stronger here.

22. Eating for  your blood type is a proven way to ensure that you eat what is best for your body.

False. There is no science behind the idea that blood type has anything to do with food intake. Read more about the misinformation behind blood type diet theory here.

23. A drink or two a week won’t make a difference in your weight loss efforts.

False. Alcohol goes a long way in stopping your efforts to lose body fat. Read more about drinking and weight loss here.

24. Carbohydrates can make some people gain weight faster than anything else.

False. Any food, be it a protein, carbohydrate or fat consumed in quantities exceeding the caloric requirements of your body will make you gain weight. Fats, with a caloric value of 9 kcals per gram are actually more likely to make you gain weight as they have more calories than carbohydrates which have 7 calories per gram, but all things being equal eating anything more than you should will make you gain weight. Regardless of genetics. Read more about calories here and read more about the lack of evidence supporting a genetic link to modern obesity here.

25. The simplest way to eat well is to eat foods in as natural a form as possible with some degree of moderation.

True. The more unnatural a product is, the more likely it may not be the best decision for you to eat it. Read more by following updates on my Twitter account here.

Thanks for taking the test!

Kevin Richardson is an award winning fitness writer, one of the most sought after personal trainers in New York City and the creator of Naturally Intense High Intensity Training^TM. Get a copy of his free weight loss ebook here. If you live in the New York metropolitan area and need help losing weight or toning up and taking your body to the next level with a time saving and practical system of diet and exercise, give Kevin and his team a call at 1-800-798-8420 or click here to get started with 50% off your trial personal training session.

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The Slow Metabolism Myth- Understanding The Role Of Metabolism in Weight Gain

It is a disarmingly simple concept- some people are cursed with a naturally slow metabolism and gain weight in spite of how carefully they watch what they eat. On the other side of the spectrum, a fortunate few are blessed with fast metabolisms which allow them to eat any and everything without gaining weight. As a central aspect of the idea of genetic predispositions towards weight gain and obesity, the slow metabolism hypothesis has long been hailed as a common explanation as to why some individuals appear to gain weight no matter what they do. As popular an argument as this may be there is ample evidence to the contrary  (read my article on genetics and weight gain) and the rationale of genetically predetermined disorders can’t account for the prevalence of obesity throughout Westernized populations. Such notions nevertheless do increase the sales of many fitness related products while adding to the cacophony of misinformation regarding the role of our metabolism in losing and gaining weight. Unfortunately, an individual lacking in-depth knowledge of nutrition and physiology can’t necessarily see any distinctions between rational deductions from observable evidence and baseless speculation. Most of what passes for fitness related information today is either a form of entertainment or ideologically driven pseudoscience, propagated by those who stand to profit the most. The complex nature of how our body works is often dumbed down to simple concepts that people feel they can relate to easily. The idea of slow metabolisms being a widespread problem for millions of people and the cause of your own seemingly inexplicable weight gain is one that is delightful empowering as it lays the ‘blame’ for your extra pounds on your somewhat underperforming metabolism. This argument makes you feel better about yourself and more inclined to purchase products that purport to help you lose weight by speeding up your metabolism in one way or the other but this is hardly the case. The reality is that weight gain isn’t mysterious and slow metabolisms are hardly to blame.

What Does Metabolism Really Mean?

Metabolism is defined as the total sum of all the chemical reactions taking place in your body. Our metabolic processes fall into two categories, they are either anabolic- which refers to the action of building up, or catabolic- which refers to the mechanism of breaking down. A classic example of an anabolic process in our metabolism is muscle building, where as a response to the stress of exercise our body increases the amount of skeletal proteins. An increase that we externally observe as our muscles getting bigger and stronger (see my article on how muscles get bigger and stronger for a more detailed description). Catabolic metabolic processes are the exact opposite and a common example would be the breaking down of our foods to provide energy for the cells in our body and thus keep us alive. When we are healthy these processes occur in a state of equilibrium, a balance that is referred to as homeostasis.

There is one other important but somewhat complex concept to contend with in understanding metabolism and that is the first law of thermodynamics. The first law of thermodynamics states that energy cannot be created or destroyed and so conceptually in a fixed physiological system such as a living organism, total energy coming in must be the same as the total energy out, unless some of it is lost or stored. Energy coming into our body refers to the calories we obtain from food and drink. Energy going out refers not only to energy used in physical activity but also for the work performed by the cells in our body. Work in this context also applies to the biological work of repairing cells, and our body’s struggle to maintain homeostasis such as the constant regulation of body temperature. Even reading this article requires some element of biological work as your muscles contract to keep your eyes focused on the screen.

How We Measure Metabolism

The primary way that our body produces energy is through the combustion of carbohydrates and fats in the presence of oxygen. This function is called aerobic metabolism, and it leaves behind measurable byproducts in the form of carbon dioxide and water. That being the case we can roughly  estimate an individuals’ metabolism by measuring the amount of oxygen consumed and the volume of carbon dioxide produced. The process to measure metabolism is called indirect calorimetry. Calorimetry means the measuring of heat energy given out or taken in and the term ‘indirect’ is used since we can’t exactly measure the amount of carbon dioxide coming out of each cell in your body at any given time. We can however get an overall view of what’s going on by observing the exchange of carbon dioxide and oxygen from your lungs.

A device called a metabolic cart is used to measure these gases and it requires you to wear a mask very similar to what a scuba diver would wear, except it doesn’t provide air but rather records air coming from your lungs. From indirect calorimetry we can calculate your basal metabolic rate- which is the minimum metabolic rate your body requires to maintain your body weight and functions.[1] Many factors can affect your basal metabolic rate such as genetics, age, gender, hormones and most importantly for our purposes- diet and activity level. When the amount of food energy (calories) ingested is more than what your body uses then  there is a concurrent gain in body mass.[2] This gain in body mass is our body’s way of storing energy for a time when it isn’t readily available and the way it does so is in the form of fat tissue. Our ability to store considerable reserves of energy in the form of fat is one of the hold offs from our past, serving to help our ancestors of survive countless famines and the scarcity of food that has defined human life for the past several thousand years.

The Slow Metabolism Myth

Getting back to the idea of a slow metabolism, average metabolic rates for men are estimated to be about 1.0 kilocalories per hour per kilogram of bodyweight. Women usually have slightly slower metabolisms than men (and we will explain why) and their metabolic rates are usually about 0.9 kilocalories per hour per kilogram of bodyweight. It seems natural to think that someone who is overweight and has difficulty losing weight might have a slower pthan normal metabolism but contrary to popular opinion, someone who is obese would have a GREATER energy expenditure than someone who is thin.(3) The mechanics of it makes total sense as it takes more energy to maintain a larger body mass.[3] The bigger the organism the more energy is needed for homeostasis as someone weighing over 400lbs has far more biological and mechanical work to do than someone weighing 150lbs. So why do some people struggle with weight gain while others don’t? It must be emphasized that the causes of obesity are complex however differences in rates of metabolism are not valid explanations as to why it happens.

One key issue is our inherent difficulty in estimating exactly how much food we consume  during the course of a day- a challenge that studies have shown can be even harder for those who are overweight.[4] As much as we may think we know how much we eat on a regular basis, indirect calorimeter testing has shown time and time again that even the most conscientious among us tend consistently under-report our food intake. Compounding this issue is the unfortunate reality that it doesn’t take much for our body to gain weight. Our bodies have no way of knowing that food is available to many of us in developed countries to the point where we throw away billions of pounds of it every year. All our bodies know is that storing excess energy is critical for our survival as it is nevertheless designed to endure continued periods of low food supply. That being said we are all very much efficient at gaining weight and keeping it on and we do so with an ease that is hard for most to fathom. To put the average human’s weight gaining ability in perspective, a weight gain of 44 pounds over the course of ten years would only require you to eat 30-40 kilocalories more than your body needed everyday.[5] That’s all it would take. Not a ton of junk food nor hefty servings of high calorie food and drink. Just half of an apple, a plum, a cup of asparagus, 1/7 of a cup of rice, 1/3 of an ounce of cheese, or 2 fluid ounces of soda over your daily energy expenditure requirements would add over forty pounds in a decade if there was no change in energy requirements. A sobering thought, but one of the many reasons so many people gain weight. It really doesn’t take much at all for it to happen.

Slow Metabolism Versus Fast Metabolism Explored

A study presented at the 2008 annual Endocrine Society Conference in San Francisco further highlights the problems with the slow metabolism concept as it was demonstrated that obese people process food at exactly the same rates way thin people do when they are in a rigidly controlled environment. In a study conducted at the University of Colorado Health Sciences Center in Denver, 26 naturally thin individuals with Body Mass Index (BMI) counts between 19 and 23 who considered themselves to have a fast metabolism were compared in a carefully monitored environment to 23 individuals with BMI’s of 23-27 who identified themselves and family members as ‘obesity prone’ to see if they could overeat and not gain weight since they appeared to have a naturally higher metabolic rate than those who had problems with weight gain.

In both groups metabolic rates were tested after the subjects ate a normal diet and again after three days of eating 40% more food than their individual energy requirements. All subjects underwent two one-week dietary study periods, with four days of a control diet followed by three days of either eating exactly the amount of calories for their calculated energy expenditure or overeating. Metabolic rates were tested using the indirect calorimetry method and all foods were carefully prepared and monitored following a standard of 20% protein, 30% fat and 50% carbohydrates. At the end of the study researchers found that both groups had higher metabolic rates at rest after overeating for three days compared to when they ate a normal diet but the increase was the same for both groups. Researchers had theorized that energy expenditure and fat oxidation would increase following overfeeding in the ‘fast metabolism’ group, which would explain the process protecting them from gaining weight, but this turned out not to be the case at all.

Difficulties in Estimating Food Intake As A Weight Gain Factor

These findings were consistent with what many other studies have found  time and time again, which is that some people have a hard time balancing their daily caloric intake with how it relates to their actual energy needs. Thin people don’t have faster metabolisms that somehow save and protect them from weight gain, and those with problems losing weight don’t have slow metabolisms. Over the past twenty years of my career as a personal trainer I have had very similar experiences. I started out being convinced that there were people who suffered from slower metabolisms and that they would gain weight easily while others (myself included) found it ridiculously hard to gain weight. As time went on my observations and personal experiences proved both concepts to be flawed as everyone who trained consistently and ate in accordance to their individually designed dietary plans were able to get into fantastic shape as long as they stuck to the program. It didn’t matter if they were overweight all their lives or if they were previously unable to lose weight, the only differences were that those who had more weight to lose took longer to get to a point where they had a high degree of definition as compared to those who started at a lower body fat percentage to begin with. On the other hand- everyone who had trouble gaining weight because they thought they had a ‘fast metabolism’ was able to gain significant amounts of muscle mass as long as they adhered to the diet prescribed for them and a training program designed to stimulate muscle growth.

I always believed that I had a fast metabolism as I was painfully thin for the earlier part of my life. I started weight training at 125 lbs at six feet even, but my metabolism had nothing to do with my ability to gain weight. As long as I ate in accordance with  the dietary plan designed to help me get bigger I gained weight. It took a lot longer for me to do so to the point where it would show but I was able to put on over a hundred pounds of lean muscle mass over the course of 17 years or so without the use of any drugs whatsoever. As for the protective aspect of a ‘fast metabolism’, in the days when I ate junk- I got fat like everyone else. Today I stay steady at 225lbs at about 6% body fat not because of a fast metabolism but because I am always on point with what I eat and my program of high intensity training. When I didn’t eat as well as I do now I tipped the scale at an ungodly 252 lbs looking nothing like how I do today. If I ‘relax’ my eating there isn’t a magic parachute waiting to protect me from getting fatter if I overeat and indulge in the wrong foods and the same applies to everyone else.

Beyond The Energy Balance Theories- How What You Eat Plays A Part In What You Weigh

As straightforward as this may sound it isn’t the end of the story, as weight gain is even more complex than simply saying that eating too many calories will make you gain weight. The laws of thermodynamics and the theory of energy expenditure versus energy requirements don’t completely explain why people keep gaining weight as the years go by. Given the energy balance principles there should be a finite point where weight gain reaches a plateau as energy demand rises with increases in body mass but this doesn’t happen at all as many continue to gain weight throughout the course of their lives.[7] Alternate and perhaps more accurate models take a look at the role of modern food ingredients as a reason some people keep accumulating those extra pounds. Fructose derived sweeteners (sucrose and high fructose corn syrup) can trigger increased fat tissue accumulation in addition to increasing appetite- a vicious cycle which usually leads to a decrease in activity.[7] This model for why we gain weight places emphasis more on what you eat in addition to how much you eat as the two seem to be very closely related.

In the end it is hard not to make simple cause and effect judgments. The slow/fast metabolism neatly explains everything and in many cases places an uncontrollable factor into the equation. One that can be easily blamed for the extra pounds around your waist, but this simply isn’t the case for the vast majority of individuals. Hormonal disorders and some medications seem to have a part in weight gain as well but in most instances it really comes down to an awareness of what you eat, how much of it you eat and how active you are to deal with the calories you are taking in.

Related Articles:

Why We Regain Weight- The Leptin Connection

Food And Self Control- How Do You Stop Cravings?

Obesity And Chronic Disease- Is It Genes Or Lifestyle?

References:

1. Kaiyala KJ, Ramsay DS: Direct animal calorimetry, the underused gold standard for quantifying the fire of life. Comp Biochem Physiol A Mol Integr Physiol. 25 April 2010

2. Canadian clinical practice guidelines on the management and prevention of obesity in adults and children

3. Kushner, Robert (2007). Treatment of the Obese Patient (Contemporary Endocrinology). Totowa, NJ: Humana Press. pp. 158. ISBN 1-59745-400-1. Retrieved April 5, 2009.

4. Peter G. Kopelman, Ian D. Caterson, Michael J. Stock, William H. Dietz (2005). Clinical obesity in adults and children: In Adults and Children. Blackwell Publishing

5. Björntorp P. Obesity. Lancet 1997; 350: 423–6

6. Carlsson B, Lindell K, Gabrielsson B, et al. Obese (ob) gene defects are rare in human obesity. Obes Res 1997; 5: 30–5

7. Wells JC, Siervo M. Obesity and energy balance: is the tail wagging the dog? Eur J Clin Nutr. 2011

Kevin Richardson is an award winning health and fitness writer, one of the most sought after personal trainers in New York City and creator of Naturally Intense High Intensity Training™. Get a copy of his free weight loss ebook here. If you live in the New York metropolitan area and need help losing weight or taking your body to the next level give Kevin and his team a call at 1-800-798-8420 or click here to get started with 50% off your trial personal training session.

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A Comprehensive Guide To Eating Out & Staying In Shape- Restaurant Rules

Part 1 of 2

It used to be really simple. If you don’t want to gain weight and always eat healthy just cook all of your meals at home and don’t eat out at restaurants. It’s how I grew up back in the islands and it works- but as effective as it may be in terms of having complete control over what goes into your body, eating only home cooked meals simply isn’t always possible for everyone in today’s fast paced world. More and more people have little choice but to eat out on a regular basis as home cooked meals aren’t always practical if you are always on the run. Ask your grandparents and they’ll tell you that jobs today aren’t anything like what they were several decades ago. Our information intensive environments coupled with an ultra-competitive job market have made 40 hour weeks all but obsolete and it isn’t uncommon for many to have to endure 50-70 hour work weeks to get by. Such arduous hours make it impractical if not impossible for many to find the time or the energy to cook everything they need for the coming week. For others, eating out is an integral part of their job description if not a regular event that is part of their office culture, needless to say, while eating only home cooked meals may be the easiest way to stay in shape- it is very much possible to eat out and keep the pounds off as well. It takes some doing but it isn’t impossible.

I, for one, eat out on a pretty regular basis, so much so that I’ve been a Zagat reviewer for the past ten years or so, here in New York City and not in any way does it force me to make compromises in terms of consistently eating well. That being said, you do have to be knowledgeable of what you can and cannot eat on the restaurant menu and you can’t expect to find something wholesome at a fast food chain. Too often, health fanatics isolate themselves from their friends and family by not going out to eat and in so doing they miss the opportunity to partake in one of the most ancient of human social activities- which is in sharing a meal. It doesn’t have to be that way and it shouldn’t be. Being healthy isn’t about living a Spartan and hermetic existence- it’s about balance, and when done judiciously, eating out can easily find a place in a healthy lifestyle. In part one of the Eating Out Guide, I will do my best to outline some of the basics  to keep in mind when eating out in general and in part two I will cover in detail the food selections available to you and what you should avoid in over a dozen different popular cuisines. Thanks for reading and I hope this guide not only encourages you to eat out at good restaurants but also helps you keep your waistline trim at the same time.

The Psychology of Eating Out & Staying In Shape

The Rules

1. Don’t be negative-  If you think that there’s nothing healthy to eat- you won’t find anything healthy to eat.
2. Your parents aren’t watching- Just because it’s on your plate doesn’t mean that you have to eat it
3. You are the boss so don’t be afraid to ask for what you want the way you want it.

Rule 1. There is always something you can eat if you are at a good restaurant

One of the biggest mistakes when you are eating out is to think that you don’t have any healthy choices. Such a predisposition only makes it more likely that you will indeed eat eat junk food and is one of the reasons people blow their diet when eating out or ordering in. In Ninjutsu, the martial tradition that I have taught and studied for the past few decades,  there is a sub-discipline called tonpo- the art of escape. You may wonder what the art of escape has to do with eating out, but the fundamental precept of tonpo is that if you believe there is no way out then it is unlikely that you will ever find one. However if you see things for what they are without a prejudiced point of view and remain alert, you will find that there is almost always a way out. With regards to eating out, if you go to a restaurant and resign yourself to eating poorly then that’s exactly what you’ll do. You’ll only see the poor choices on the menu and won’t have the perspective of trying to make the best of the choices before you. If you are always  positive that there must must be something healthy on the menu then you’ll most likely find it and make wiser choices. Keep in mind that these precepts won’t always work in a dive or fast food restaurant and it’s another reason why you should always eat or order in from quality establishments. It costs a bit more but you are more than worth it.

Rule 2. Just because it’s on your plate doesn’t mean you have to eat it.

When we were children most of us were taught to always finish what was on your plate. Growing up it was often painful to be confronted with something I didn’t like as I knew that if it was on my plate I had to eat it. While this is great principle to teach kids the value of food and not to be wasteful, it can cause more problems than it solves when we are adults as it can encourage us to overeat. Especially given the over-sized portions served at many restaurants here in the United States. Compounding the ingrained traits of always eating what’s on your plate is the conviction that you’re not getting the most for your money if you don’t eat your money’s worth of food. It might be good economics- but good economics is actually one of the reasons our nation faces obesity problems in the first place (read my article on the Economics of Obesity here). These ways of thinking do little to promote healthy eating habits and hinders you from making sensible judgements about what goes into your body and encourages a very negative way of looking at food. Such points of view create great consumers but fall far short of creating healthy individuals.

It can be hard to not eat everything and not feel wasteful, but a different point of view can make all the difference. If I’m at a restaurant and an order of mashed potatoes automatically comes with my main course, I look at it from the point of view that I only paid for the main course and not the  included mashed potatoes. From my perspective the extras are thrown in for free and I am always very firm about asking that any extras that I will not eat stay in the kitchen and not on my plate. By focusing only on what I ordered and not having the included side dishes on my plate makes much easier to not give in and something out a misplaced sense of obligation. Sometimes the side dish is already on your plate, in which case you just have to keep your goals in perspective. You can get some practical tips on avoiding the temptation of food right in front of you in my article on avoiding temptation here.

Rule 3. Remember that at a restaurant that you are the boss.

When was the last time you were at work and your boss asked you to do a project a particular way but you chose to do it your way instead and he or she was perfectly fine with it? Doesn’t happen too often in the real world, does it? And the same applies to the restaurant staff when you are eating out. When you order at restaurant of any kind- you are the boss. Not the waiter and not the chef, just you. That being said you shouldn’t be afraid of hurting anyone’s feelings since it’s their job to see to it that you get what you want. That’s the contract between a customer and any reputable restaurant, when you want something cooked a certain way you should be able to get it prepared just the way you want it. This is another reasons I advocate restaurants over fast food chains. In a real restaurant your preferences are far more likely to be accommodated. You can’t ask for your hamburger without salt or additives at McDonald’s nor should you expect such levels of service at as such establishments. It’s very much take it or leave it and my advice would be to always leave it and eat somewhere else. You aren’t the boss and so it is always worth the extra money it costs to eat at a better place.

Click here for part two of our Eating Out Guide as we cover over a dozen different cuisines and what you need to know to make the best food choices when ordering them:

Eating Out & Staying Healthy- A Restaurant Guide by Cuisine

Kevin Richardson is one of the most sought after personal trainers in New York City and the creator of Naturally Intense High Intensity Training™. Get a copy of his free weight loss ebook here. If you live in the New York metropolitan area and need help losing weight or taking your body to the next level give Kevin and his team a call at 1-800-798-8420 or click here to get started with 50% off your trial personal training session.

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The Scientific Argument Against Blood Type Diets

Blood type diets have been in vogue for several years now and have generated significant incomes for many a ‘nutritionist’. The founder, Dr. Peter D’Adamo proposed that blood type is directly related to how our bodies react to certain foods, and that you should eat a diet specific to your blood type for optimum health and weight maintenance. There are a slew of celebrities who swear by it along with many big names in the nutrition field. As popular as it may be, the blood type diet, like so many others lack any credible foundation in scientific fact. Science is often absent in almost all the literature promoting diets and nutrition, and one of the greatest downfalls of our time is that it has become very difficult for the average person to differentiate between scientific facts and product promotion. However, by understanding the science of how our different blood types came to be, you can’t help but be amazed at how misleading and how ridiculous the idea of eating for your blood type really is.

The premise of blood type diets is that blood types somehow evolved as we did as a species. The theory, put forward by Dr. D’Adamo and bold type proponents is that the universal blood Type O evolved first, due to our hunter gatherer lifestyle. As such, individuals with this blood type should gravitate towards eating a high protein, Paleolithic type diet. As time went on, (around 15,000′s BC), Blood Type A came into being, as man switched from being a hunter gatherer to a more agricultural lifestyle. As such people with Type A blood should eat a primarily vegetarian diet. Blood Type B supposedly came into existence at 10,000 BC, when somehow some groups of humans suddenly became nomadic and were eating a diet of grains. Finally, within the past thousand years, Type AB surfaced from people who ate a wide variety of food. According to blood type diet advocates, there is research showing that a specific set of proteins called lectins interact with the different ABO blood types. The theory goes on to say that this research has found that these lectins can be incompatible and even harmful with some blood types so people with different blood types should eat different foods.

Fact: Blood Types Evolved Before Humans Did

Sounds pretty scientific, but only if you don’t have an understanding of biology. It is an accepted fact that polymorphism, (the different ABO Blood Types) which was  discovered and categorized by Karl Landsteiner in 1900,  occurred millions of years ago, not thousands of years ago. This isn’t an esoteric piece of information as the evolution of human blood types has always been a cornerstone of scientific research into our ancestral origins.  One of the problems with science is that many find the terminology a bit intimidating, but I can assure you that it isn’t as complicated as it seems, and taking the time to keep abreast with findings in science make it really hard for you to fall for the pseudoscience found in so many pieces of advertising. Here is a breakdown of how blood types evolved:

The type of blood a person has is determined by alleles at a single locus at chromosome 9.[1] These alleles encode for different amino acids called glycotransferases.

In blood type A, cytosine at nucleotide site 793 translates to leucine 265 and guanine at nucleotide site 800 translates to glycine 267.

In order blood type B, the cytosine at 793 translates to methionone 265 and the guanine at 800 to alanine 267.[1]

Blood type AB occurs when both changes occur.

Blood type O is caused when an inactive or nonfunctional protein is coded.

Studies have shown that polymorphism exists in other primates as well as all anthropoid primates. [2]Given the similarities found between human blood and that of several primates, scientists are able to use what they know based on the average mutation rate that must have occurred for there to be a divergence of A and B blood types. Using those estimates, some scientists conclude that A and B types diverged at least 13 million years ago[3]. These findings completely contradict the blood type diet conjecture about blood types being fairly recent occurrences, as polymorphism seems to have occurred at least eight million years before the first ape-like man even began walking on two legs. Other studies estimate that the blood groups would have diverged 4.5 to 6 million years ago, but in spite of the differences in estimation all accounts point to polymorphism being an occurrence that predates modern man.

From these findings there is evidence that A and B may have been the original blood types and not Type O as the blood type theory claims. Type O seems to represent an abnormal mutation as a result of a defective gene as normal genes such as A and B cannot evolve from abnormal ones.[4,5,6,7,8, 9, 10, 11] Although the O blood type is common in all populations around the world [12], there is no evidence that the O gene represents the ancestral gene at the ABO locus. Nor is it reasonable to suppose that a defective gene would arise spontaneously and then evolve into normal genes.

Fact: Bacteria & Viruses Account For Differences In Blood Types In Different Populations- Not Food

Another flaw in the blood type diet theory is the idea that specific foods are responsible for our blood type variations when diversity of blood types among specific populations can be traced to an evolutionary defense against bacteria and viruses. People have either blood group A, B, AB, or O, with each type occurring at different frequencies in populations around the world. Robert Seymour and his colleagues at University College in London used mathematical models to show that this diversity is caused by natural selection pressures imposed on human populations by viral and bacterial infections [13] and not from the foods they eat.Their model reveals that if viral infections dominate a population, blood type O will be most common, whereas if bacterial infections are more common, then A and B blood types will be more frequent. Food differences have nothing to do with it.

Fact: Race Has Nothing To Do With Blood Type Or The Foods You Should Eat To Stay Healthy

That race has anything to do with blood type or what foods we eat is not an idea supported by human biology. Race in and of itself is not a biological reality. A race is a biological subspecies or variety of a species, consisting of a more or less distinct population with anatomical traits that distinguish it clearly from other races. This biological definition does not line up with human genetic variation as humans are extremely homogenous. In fact every one of us is 99.9% genetically identical, with most of the differences stemming from gender and individual personality traits. Such homogeneity is not commonplace among other animals, even among some of our closest biological relatives; chimpanzees have 2-3 times more genetic variation than humans, while orangutans have 8-10 times more variation.

Fact: Avoiding Modern Refined Foods, Eating Moderately & Exercising Help Everyone Get Into Better Shape- Regardless of Blood Type

In twenty years of working with people from all over the world I have found that there are very few differences in the dietary practices required to help someone lose weight or get into great shape. Differences abound in terms of preferences, which is completely cultural influences and occasionally due to certain allergies. True some populations can tolerate certain foods better than others, but at the end of the day anyone following a diet comprised of only naturally occurring foods in amounts proportional to their activity level can lose weight and get into fantastic shape if they eat and exercise consistently. There is no gimmickry, nor any instant solutions with diets that try to make things more complicated than nature intended, as change takes time, but for that to happen, we have to have faith. Not in blood type diets, Dr.D’Adamo’s or Dr. Atkins, instead we have to learn to have faith in ourselves.

Kevin Richardson is an award winning health and fitness writer, natural bodybuilding champion, creator of Naturally Intense High Intensity Training and one of the most sought after New York City personal trainers.  Get a copy of his gimmick free weight loss ebook on losing weight here. If you live in the New York City area and need help losing weight or getting into shape give Kevin and his team a call at 1-800-798-8420.

References:

1. Martinko, J. M., V. Vincek, D. Klien and J. Klien. 1993.Primate ABO glycosyltransferases: evidence for trans-species evolution. Immunogenetics

2. Jared Diamond: Guns Germs & Steel (1997)

3. Martin RD. 1990. Primate origins and evolution: a phylogenetic reconstruction. Princeton, NJ: Princeton UniversityPress. McClintock T..

4. Yamamoto F, Clausen H, White T, Marken J, Hakomori S. Molecular genetic basis of the histo-blood group ABO system. Nature 1990;345:229-233.

5. Yamamoto F, McNeill PD, Yamamoto M, Hakomori S, Bromilow IM, Duguid JKM. Molecular genetic analysis of the ABO blood group system: 4. Another type of O allele. Vox Sang 1993;64:175-178.

6. Grunnet N, Steffensen R, Bennett EP et al. Evaluation of histo-blood group ABO genotyping in a Danish population: frequency of a novel O allele defined as O2. Vox Sang 1994;67:210-5.

7. Olsson ML, Chester A. Frequent occurrence of a variant O1 gene at the blood group ABO locus. Vox Sang 1996;70:26-30.

8. Mattos LC, Sanchez FE, Cintra JR et al. Genotipagem do locus ABO (9q34.1) em doadores de sangue da região noroeste do Estado de São Paulo. Rev Bras Hematol Hemoter 2001;23(1):15-22.

9. Olsson ML, Chester A. Frequent occurrence of a variant O1 gene at the blood group ABO locus. Vox Sang 1996;70:26-30.

10. Yamamoto F, McNeill PD, Yamamoto M, Hakomori S, Bromilow IM, Duguid JKM. Molecular genetic analysis of the ABO blood group system: 4. Another type of O allele. Vox Sang 1993;64:175-178.

11. Grunnet N, Steffensen R, Bennett EP et al. Evaluation of histo-blood group ABO genotyping in a Danish population: frequency of a novel O allele defined as O2. Vox Sang 1994;67:210-5.

12.  Mourant AE, Kopec AC, Domaniewska-Sobczak K. The distribution of the human blood groups and others polymorphisms. London: Oxford University Press, 1976. 140p.

13. Proceedings of the Royal Society B, DOI: 10.1098/rspb.2004.2674). – The New Scientist

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