Like many other health professionals (and lay people), I used to believe I needed to take dietary supplements like branched-chain amino acids and begin every workout with a pre-workout drink to maximize my gains. I thought that cutting carbohydrates was the only way to lose fat and that a yearly detox was essential to keep my body free of toxins.
More often than not, it’s fitness fanatics, gym rats, and weekend warriors who believe in dogma and myths—but this can also be true of health professionals like me. A lot of the myths about physical fitness and performance have their beginning in the fitness industry. Regrettably, these ideas and myths are passed on from more senior gym members to newbies. They are seen as facts and accepted as accurate without being questioned.
These myths often overcomplicate fitness and are, in many instances, directly counterproductive to people’s goals. Fitness myths can be viewed like viruses: highly contagious and resilient to extermination once they’ve spread. Ideas can either help us grow or destroy us.
Fitness myths can be viewed like viruses: highly contagious and resilient to extermination once they’ve spread. Share on XUnfortunately, myths can be significant energy thieves. We only have a limited amount of energy each day. Spending a lot of energy on ideas that are counterproductive to our goals will reduce or even eliminate our chances of reaching them. If my vacation goal is to do a cross-country road trip from Chicago to LA, driving in the opposite direction will be a waste of time and disadvantageous to my goal. The same can be said for many of the myths below: they squander our valuable time and often also our hard-earned cash.
I still remember working late nights as a personal trainer in a small box gym, getting stressed since my evening meal was typically consumed late. I recall the self-directed anger and blame because I could not keep an optimal eating schedule; therefore, it was very liberating when I learned that frequent meals do not stoke the metabolic fire and that eating a late dinner would not magically turn the food into fat.
Rely on Research, Not Myths
The primary purpose of this article is to help people refrain from squandering a large amount of energy on counterproductive myths, thereby increasing their chances of succeeding with their goals. If knowledge is power, misinformation is inability.
To objectively and critically evaluate a given health claim, we need to look at objective research data. We cannot just rely on our own subjective experience. Experience and memory are highly prone to errors. They are subject to multiple statistical inaccuracies, not to mention that we lack a valid comparison between ourselves and a comparative control group.
Humans have an incredible capacity to fool themselves, which is why the scientific method is such an essential tool for gaining objective and reliable information. Therefore, if we want factual and accurate nutrition or physical fitness knowledge, we should use the highest quality of information, i.e., research.
The problem with your subjective experience is this: You’re trying to cut a big hole in your living room to fit an extra window but using your arms and hands to measure the size of the hole you need to make. The main problem is not that what you measure cannot be correct; the main problem is that you don’t know if you’re right or wrong. This is why we use a measuring tape; it adds a degree of objectivity to our measurements.
The List of Myths
Below are 21 of the most common myths in the realm of performance and physical fitness:
1. Cutting carbohydrates is the fastest way to lose weight and fat mass.
Fact: Cutting carbohydrates is not necessary to lose weight. A calorie deficit, which is a negative calorie balance, is the primary factor responsible for weight loss. The primary goal of any weight loss diet should be to maintain a calorie deficit.1,2
2. Branched-chain amino acids are essential if you want results in the gym.
Fact: Branched-chain amino acids (BCAA) are not needed. Adequate protein is sufficient; aim for 1.4–2.0 grams of protein per kilogram of body weight per day. Using protein supplements is a safe and convenient way to increase protein intake. However, getting adequate protein can be done without supplementation, i.e., by eating ordinary food.3,4
3. A yearly “detox” diet is needed for a healthy body.
Fact: Detox diets are nonsense, and you don’t need them. The idea that toxins accumulate in the body is a myth and not based on current knowledge. However, detox diets can increase health risks and lead to nutritional inadequacy.5,6
4. Sugar and carbohydrate intake are the leading cause of the obesity epidemic.
Fact: Sugar or carbohydrates do not cause weight gain. Any macronutrients that lead to a calorie surplus can cause weight gain. Carbohydrates are not more fattening than fat. An argument can be made that protein is the least fattening compared to carbohydrates or fat.7,1
5. Sugar causes diabetes.
Fact: Sugar does not cause diabetes. Diabetes (type 2) is a multifactorial disease, where a diet with a calorie surplus combined with a sedentary lifestyle leads to problems with insulin secretion and insulin resistance. Early developmental factors (such as prenatal exposure) also have a role in susceptibility to diabetes.8,9
6. The obesity epidemic is caused by eating fast food.
Fact: Obesity is not only caused by eating fast food, and that is an overly simplistic view. The most plausible primary driver of obesity is a consistent caloric surplus, highly influenced by an “obesogenic” environment characterized by extreme availability of hyper-palatable, highly tempting, energy-dense foods.10,11
Obesity is not ONLY caused by eating fast food, and that is an overly simplistic view. The most plausible primary driver of obesity is a consistent caloric surplus. Share on X
7. Stretching will lengthen your muscles.
Fact: Static stretching does not make your muscles longer. The idea that you can “lengthen” your muscles is a bit of a stretch because you can’t anatomically change the length of your muscle tissue; if you could, in fact, lengthen your muscles, it would compromise joint integrity and joint stability. It would also compromise the contractile properties and, as such, also lead to decreased functional capabilities.
“Plastic deformation” is the technical term for lengthening your muscles. Current research refutes the idea that we can lengthen our muscles through regular stretching routines. Most likely, the force needed for plastic deformation is far outside the human physiologic range—meaning it is outside the capabilities of regular stretching routines.
The main reason stretching leads to increased flexibility is alterations in the sensation such that stretch tolerance or the onset of discomfort occur at increased joint positions, thereby increasing flexibility. A curious fact is that research has shown that resistance training, when done with a full range of motion, has similar effects on flexibility as stretching.12–16
8. Pre-workout static stretching is required to decrease injuries and muscle soreness.
Fact: Static stretching does not reduce injuries or decrease the risk of Delayed Onset Muscle Soreness (DOMS). Do stretching if you like it, but skip it if you only do it because you think it will reduce injuries or muscle soreness. It should be noted that some research indicates that static stretching negatively influences performance17 during warm-up routines and should generally be avoided.18–27
9. Protein powder will cause kidney failure.
Fact: Using protein powder (typically whey protein) is safe and has no negative effects, nor does it adversely affect renal function in healthy, active individuals.28,29
10. Fasted aerobic exercise is needed to burn fat.
Fact: Exercising on an empty stomach in the morning does not burn fat better. Fasted aerobic exercise has the same effect as non-fasted aerobic exercise. Our bodies do not work that way; the body is not better at burning fat in the morning than later in the day.30
11. Sit-ups are the best way to get visible six-pack abs.
Fact: “Spot reduction” is the technical term for reducing fat mass in a specific spot, like the abdominal region. Spot reduction does not happen; our bodies do not work that way.
Spot reduction does not happen; our bodies do not work that way. Share on XAs Professor Brad Schoenfeld noted: “It’s a physiologic impossibility. All the sit-ups in the world won’t give you a flat stomach.” The belief that you can spot-reduce most likely comes from wishful thinking and dubious marketing tactics, like some health professionals seeking to increase their popularity and revenue.31–34
12. Running causes “wear and tear” in your knees.
Fact: Recreational running is not bad for your knees; recreational running actually has a protective effect against hip and knee osteoarthritis. Research has found that 13.3% of competitive runners have hip and knee osteoarthritis, while only 3.5% of recreational runners and 10.23% of sedentary and non-running individuals have it.35 So competitive runners and sedentary individuals have almost similar occurrences of osteoarthritis. In contrast, recreational runners have a much lower occurrence of osteoarthritis.36–40
13. Eating smaller frequent meals will increase your metabolic rate.
Fact: Eating smaller and more frequent meals does not increase your metabolic rate. Increased meal frequency does not increase total energy expenditure or metabolic rate. Frequent meals do not play a significant role in weight loss. Furthermore, the thermic effect of food is determined by the micronutrient type and size of the meal, not the specific time of eating it.41
14. Eating protein right after you work out and within the “anabolic window” is essential for gains.
Fact: Eating protein right after a workout is optional. The so-called “anabolic window” of opportunity is more like a barn door of opportunity; the feeding window is quite broad. The practical implications are that a 60-minute resistance training session could potentially have two 90-minute feeding windows on both sides of the session.42
The so-called ‘anabolic window’ of opportunity is more like a barn door of opportunity; the feeding window is quite broad. Share on X
15. The optimal reps for muscle hypertrophy are only 8–12.
Fact: The optimal rep ranges for muscle hypertrophy are not only 8–12 reps. Recent research has found that muscle hypertrophy can be equally achieved across a wide range of rep ranges if exercise is done to near technical failure. Practical applications of this could be summarized as follows: if the goal is hypertrophy, do as many repetitions as possible.43
16. Organic food is more nutritious and, therefore, healthier.
Fact: Organic food is not more nutritious. No significant health benefits result from consuming organically produced food compared with non-organic food. However, organic foods may decrease exposure to residues of pesticides and antibiotic-resistant bacteria. But this comes at a cost; organic products typically cost 10%–40% more than non-organic products.44–47
17. Not eating breakfast is detrimental to weight loss.
Fact: Not eating breakfast is not detrimental to weight loss. Eating or skipping breakfast does not affect weight loss. Weight loss and fat loss are primarily influenced by total daily calorie intake. Any meal that leads to a calorie surplus will lead to weight gain, regardless of the time of the given meal. Research does not support eating breakfast as a good strategy for losing weight. Eating breakfast could, in fact, be counterproductive in that it may cause an increase in total daily calories.48,49
18. Many dietary supplements are needed to get good results.
Fact: Most dietary supplements are not needed to get good results. BCAA, testosterone boosters like Tribulus Terrestris, fat burners, pre-workout (PWO), ZMA, omega-3 fatty acids, and multivitamins are all heavily marketed with large, undocumented claims. However, only three supplements have consistently shown an effect and are supported by the full body of research. The three supplements are: protein powder28,50 (however, food is equally as good), creatine monohydrate,51 and caffeine.52
19. Carbohydrates are more fattening than fat.
Fact: Carbohydrates are not more fattening than fat, and the reality is that carbohydrates are not easily turned into fat. “De novo lipogenesis” is the technical term for a highly regulated process in which carbohydrates, protein, or alcohol are converted into fat. Still, it does not, in most cases, contribute significantly to total fat balance.
Excess carbohydrate energy can lead to a caloric surplus, thereby increasing body fat stores. However, not by conversion of carbohydrates to fat; instead, the process of breaking down fat is reduced, and fat storage is thereby increased.53–55
20. Coffee causes dehydration.
Fact: Coffee does not dehydrate. Coffee has long been claimed to be a diuretic and, as such, cause dehydration. Research data shows that when consumed in moderation, coffee has similar hydrating qualities as water. But research does indicate that high coffee intake (caffeine intake of 6 milligrams per kilogram of body weight) can cause an acute diuretic effect. However, that means an 80-kilogram/176-pound male needs to drink around five cups of coffee (225 ml/8 oz per cup) to get an intake of 480 mg of caffeine, causing an acute diuretic effect. As a reference, the FDA and EFSA (European Food Safety Agency) have cited 400 mg a day as an amount not generally associated with dangerous or harmful effects.56–58
21. Experience gained in the gym is the only valid “evidence” needed.
Fact: Experience and memory are highly prone to errors59–61 and are subject to multiple statistical inaccuracies. When trying to find causal connections (causality), experience in itself is severely flawed. “Causal inference” is the technical term describing strategies that allow scientists to draw conclusions about causality based on objective data.
As such, personal beliefs and experiences are unreliable sources of knowledge about causal connections.62 The scientific method should be utilized when assessing causality within our complex and multifactorial environment.
The main problem is not that our experience cannot be right but that we do not know if it is. Share on XThe primary weakness of experiences is that they are uncontrolled, subjective observations. As such, they are subject to numerous flaws, like confirmation bias, memory errors, confounding variables, and multiple other cognitive biases. The main problem is not that our experience cannot be right but that we do not know if it is.
Fairy Tales Aren’t Real
This research and its implications are both good and bad news. The good news is that, through advances in our knowledge, we have a much more complete picture of what can help us get results and achieve our goals. The bad news from this research is that there are no quick fixes or shortcuts; there are no magic training regimes or dietary supplements that are a quick shortcut to results and our goals. This is a challenge for professionals or companies trying to sell quick fixes unsupported by the research.
Hopefully, you now have some more quality knowledge, so you don’t waste a lot of energy on counterproductive myths and hard-earned money on something that is only a fairy tale. And aren’t we getting a bit old for fairy tales?
Remember that if knowledge is power, then myths are energy thieves.
Thanks to nutrition researcher and educator Alan Aragon for inspiration and feedback on this article.
Since you’re here…
…we have a small favor to ask. More people are reading SimpliFaster than ever, and each week we bring you compelling content from coaches, sport scientists, and physiotherapists who are devoted to building better athletes. Please take a moment to share the articles on social media, engage the authors with questions and comments below, and link to articles when appropriate if you have a blog or participate on forums of related topics. — SF
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Since you’re here…
…we have a small favor to ask. More people are reading SimpliFaster than ever, and each week we bring you compelling content from coaches, sport scientists, and physiotherapists who are devoted to building better athletes. Please take a moment to share the articles on social media, engage the authors with questions and comments below, and link to articles when appropriate if you have a blog or participate on forums of related topics. — SF
Informative Artical.