“It is time to wind back the harms caused by the junk food industry’s public relations machinery. Let us bust the myth of physical inactivity and obesity. You cannot outrun a bad diet.”—A. Malhotra, T. Noakes, and S. Phinney1
A friend asked my opinion on an article, “Exercise Can’t Save Us: Our Sugar Intake Is The Real Culprit, Say Experts”, by Alice G. Walton in Forbes2—so here it is….
The article in Forbes is merely a summary/editorial on an editorial published in the British Journal of Medicine1. So, essentially it is an opinion about a more informed opinion. I don’t disagree with the authors’ position on sugar. I do, however, agree with my friend, who also happens to be a former student, that the articles somewhat misrepresent the role of exercise in health. It is almost presented as an either-or proposition rather than an argument that considers inactivity and sugar in the obesity problem. Moreover, there is less emphasis on the role of calorie restriction in health.
I do not disagree with the authors that the food industry and health scientists have contributed to the obesity with the promotion of sugar and a limited understanding of the role of carbohydrates in exercise, respectively. More importantly, I believe we have done a poor job of educating on the role of “macro balance” (i.e., the roles of carbohydrates, fats, and proteins in the diet) and its implications for health and body composition.
I also feel that the emphasis in the fitness industry has shifted to body composition rather than health. When I first started studying exercise physiology as an academic in the mid-1980s, the emphasis was on cardiorespiratory health—low-fat/high-carbs, aerobic exercise, smoking cessation, etc.—and cardiac rehabilitation and corporate fitness were the major career tracks. (I chose corporate fitness.) In the ‘90s, personal training began to take off, but cardio and the ACSM guidelines for weight training remained the focus (i.e., health-focused). Today, it is all about getting “abs”. (This is a bit of hyperbole, of course, but I see the emphasis to be on getting lean.)
The health side of the industry, in my opinion, over-emphasizes BMI (“body mass index”, the ratio of one’s weight in kilograms to the height in meters squared). I hear “BMI”, I think: “Marsha, Marsha, Marsha” (something to be understood only by ‘Brady Bunch’ fans). While the measure has some limited application with sedentary individuals, it is rather useless when considering the exercising population—it fails to account for the differences in muscle versus fat weight. Thus, it emphasizes body weight over body composition.
Considering the exercise v. sugar argument, it is short-sighted to under-emphasize the role either plays in obesity. I have shared before the proposed contributions to weight management (Dr. Mike Israetel and Renaissance Periodization): caloric balance—50%; macro balance—30%; nutrient timing—10%; food composition—5%; and supplementation—5%. Caloric balance should—must—consider exercise and caloric intake. As well, we must consider the quality and timing of our carbohydrate (and fat and protein) intake.
I whole-heartedly agree with Malhotra et al., “You cannot outrun a bad diet.” Running, however, is not the only form of exercise, and one must consider the type of exercise when considering macro balance and nutrient timing. One must eat to exercise rather than exercise to eat. Carbs are essential to training for muscle mass, and the timing of their intake likely takes priority over quality (within reason, of course). One cannot argue that one can offset a bad diet with exercise, not can one argue that a low-sugar diet can offset one’s inactivity. My view is diet and exercise.
I make the argument move more (both exercise and general physical activity) and eat less (with an emphasis on fueling one’s exercise and physical activity). Cut the sugar. Although the extreme ends of exercise continuum (i.e., endurance v. body-building/weightlifting) may have a bit more liberty in eating sugary food—in timing with their intensive training sessions—it should be clear that sugar is the devil. We can argue the benefits of high-fat/low-carb versus high-carb/low-fat until we are cyanotic (blue in the face), but carbohydrate content should most ideally come from whole foods whatever the amount.
There is considerable evidence that a restricted calorie diet contributes to longevity. It is clear that exercise contributes to longevity and quality of life. Sugar is clearly unhealthy. We cannot, yet, paint a picture that carbohydrates are bad. There are good carbs and bad carbs. There are good fats and bad fats. There is a total energy intake requirement suitable for each of us that is based on the individual’s basal metabolic rate, the thermogenic effect of food, and physical activity.
Bottom line? Exercise, avoid sugar and other simple carbohydrates, and focus on body composition (increasing lean muscle tissue and losing body fat). Lift (heavy) weights, do some cardio, include some HIIT/HIIRT workouts in your weekly exercise schedule, cut the sugar and junk food, limit yourself to healthy indulgences (e.g., dark chocolate and more “keto-friendly” desserts), reduce your alcohol consumption, sleep 7-8 hours a night, and keep a regular schedule (of sleep, meals, and exercise), and you will improve your health. Think of diet as eucaloric v. hypercaloric v. hypocaloric. For the most of us—those looking to be healthy and who exercise more moderately—remaining closer to eucaloric or slightly hypocaloric and striving to grow into our fat will have better benefit than focusing on losing weight via extreme caloric restriction.
I would suggest that better titles for the aforementioned articles would be: “Exercise alone can’t save us: our sugar intake is the real culprit” and “It is time to bust the myth of exercise inactivity and obesity: you can’t run and lift weights on a bad diet”.
We have to defeat the obesity problem—and it is a growing problem. We are failing on the fitness side. We are failing on the nutrition side. And, certainly, the commercial food industry is not on our side. The answer is effort. Obesity is not just a problem of inactivity. Likewise, it is not just a problem of too much sugar. Obesity (and I would include “skinny fat”—i.e., people with “healthy” BMIs but little muscle mass) is a problem of too little activity and too many calories. Exercise and monitoring food intake take effort.
Be your best today; be better tomorrow.
Carpe momento!
1https://bjsm.bmj.com/content/49/15/967.full
2 https://www.forbes.com/sites/alicegwalton/2015/04/24/exercise-wont-save-us-sugar-and-carbs-are-our-bodily-downfall/?utm_source=FACEBOOK&utm_medium=social&utm_term=Malorie%2F&fbclid=IwAR0Esbo7w4JG5k0OIKZcCGXjjhgqBWg2tDGUrYnVnQqyutu-K-wuseigTkQ#10acd2712466