OVO

Gary Taubes: The Scientist and the Stairmaster [LINK-ZUM]

For most of us, fear of flab is the reason we exercise, the motivation that drives us to the gym. It's also why public-health authorities have taken to encouraging ever more exercise as part of a healthy lifestyle. If we're fat or fatter than ideal, we work out. Burn calories. Expend energy. Still fat? Burn more. The dietary guidelines of the U.S. Department of Agriculture, for instance, now recommend that we engage in up to 60 minutes daily of "moderate to vigorous intensity" physical activity just to maintain weight - that is, keep us from fattening further. Considering the ubiquity of the message, the hold it has on our lives, and the elegant simplicity of the notion - burn calories, lose weight - wouldn't it be nice to believe it were true? The catch is that science suggests it's not, and so the answer to all of the above quiz questions is "no."

Just last month, the American Heart Association and the American College of Sports Medicine published joint guidelines for physical activity and health. They suggested that 30 minutes of moderate physical activity five days a week is necessary to "promote and maintain health." What they didn't say, though, was that more physical activity will lead us to lose weight. Indeed, the best they could say about the relationship between fat and exercise was this: "It is reasonable to assume that persons with relatively high daily energy expenditures would be less likely to gain weight over time, compared with those who have low energy expenditures. So far, data to support this hypothesis are not particularly compelling." In other words, despite half a century of efforts to prove otherwise, scientists still can't say that exercise will help keep off the pounds.

[Article continues at link. Fascinating and heretical. - Trevor Blake]

Labels: science

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