Good news if you hate the gym, bad news if you’ve invested your time, money, and faith in the body-shaping power of daily workouts: despite what most people think, there still isn’t overwhelming evidence that exercise will reduce weight. Over the past several decades, research continues to show that exercise will definitely increase your body’s energy needs but not always reduce fat, and that a sedentary lifestyle and obesity are linked but not in a proven cause-and-effect relationship. Meanwhile, the popular press has promoted and mythologized a sort of “faith-based” concept of exercise as a key requirement for weight loss.
When the Finnish investigators looked at the results of the dozen best-constructed experimental trials that addressed weight maintenance–that is, successful dieters who were trying to keep off the pounds they had shed–they found that everyone regains weight. And depending on the type of trial, exercise would either decrease the rate of that gain (by 3.2 ounces per month) or increase its rate (by 1.8 ounces).
This is why official guidelines are so weirdly neutral on the subject, saying regular exercise will “promote and maintain health,” for example, or that you should exercise to “avoid unhealthy weight gain.”
The one thing that might be said about exercise with certainty is that it tends to makes us hungry. Maybe not immediately, but eventually. Burn more calories and the odds are very good that we’ll consume more as well. And this simple fact alone might explain both the scientific evidence and a nation’s worth of sorely disappointing anecdotal experience.
“The Scientist and the Stairmaster” [New York Magazine via Metafilter]
(Photo: Getty)
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This article is directly contrary to my experience. I have gone from a size 20-22 to a size 14-16 mostly from exercise. I stopped sitting around my house and eating too much, now I lift weights and take long walks but I still eat pretty much what I want.
And I’m a lot stronger and I have better posture, endurance and flexibility too.
…which is why maybe people should worry less about the size of their ass, and more about other health indicators (ie blood pressure, serum lipids, glucose tolerance, etc etc etc etc infinity forever) that actually *prove* something about your health. Which is to say, you should exercise because it’s enjoyable and good for you. Not because it will make you thin.
And, for all you ‘simple thermodynamics’ buffs out there, where on earth did you read that the body functions like a bomb calorimeter? Because it does not. Nothing in biology is that simple.