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ASU fitness expert says new study underscores tricky nature of weight loss – Arizona State University

Sep 7th, 2017

September 6, 2017

The more you exercise, the more those pounds should just melt off, right?

Not always this according to a recent exercise study out of the United Kingdom.

Conducted by scientists from Loughborough University in Britain, the study concludes that exercise as a weight-loss strategy is tricky, complex and not as relational as one might think.

To provide a deeper understanding of the nature of weight loss, ASU Now turned to Glenn A. Gaesser, an Arizona State University professor of exercise and health promotion in the College of Health Solutions.

Glenn A. Gaesser

Question: A recently published by the Journal of Endocrinology shows that exercise isnt always a foolproof weight-loss strategy in large part because exercise makes you hungrier and many people wind up consuming more calories than they normally would. What is your philosophy?

Answer: This was a short-term study, only looking at a few hours after exercise. The real issue is what happens long-term. Most studies show that weight loss from exercise training of any type is far less than what is expected on the basis of the cumulative calories burned during all exercise sessions combined.

This is because the human body tends to defend its set-point weight, much the same way a thermostat is designed to maintain a set temperature. This involves a number of physiological and hormonal responses that essentially prevent chronic exercise from reducing body weight to unhealthy levels. The same is true when people diet.

Adaptive thermogenesis prevents most people from losing weight and/or maintaining weight loss. Set-point is an individual thing, determined largely by genes but also environment. It also tends to increase with age.

Q: How do different types of exercise affect appetite?

A: This is a tough one. Higher-intensity exercise (think sprint-type interval exercise) typically suppresses appetite at least initially. But the real issue is, as I mentioned earlier, what happens in the long term? Eventually, hunger comes back and we eat. That is why virtually every study that has been published on exercise training and weight loss shows minimal effects.

Q: Are there any good non-exercise habits or methods that blunt appetite?

A: Good luck with that one. Trying to blunt appetite is essentially trying to battle biology, and biology inevitably wins. For individuals trying to lose some weight via exercise, I would suggest assessing progress fairly frequently with the scale and making adjustments accordingly.

We also published an article in the New York Times a couple of years ago showing that weight loss early on during an exercise program was also a significant predictor of weight (and fat) loss at the end of the exercise program.

Q: Ive heard that chocolate milk is the best thing to have after a workout. True or false?

A: Chocolate milk is fine I love it. Its got carbs and protein, but not necessarily the best. The overall 24-hour dietary intake is far more important than what you eat right after a workout.

Top photo courtesy of Pixabay

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ASU fitness expert says new study underscores tricky nature of weight loss - Arizona State University

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