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...although the muscle-fat relationship is often misunderstood. According to calculations published in the journal Obesity Research by a Columbia University team in 2001, a pound of muscle burns approximately six calories a day in a resting body, compared with the two calories that a pound of fat burns. Which means that after you work out hard enough to convert, say, 10 lb. of fat to muscle - a major achievement - you would be able to eat only an extra 40 calories per day, about the amount in a teaspoon of butter, before beginning to gain weight. Good luck with that...

Author: /time Magazine | Title: Why Exercise Won't Make You Thin | 8/9/2009 | See Source »

...Fundamentally, humans are not a species that evolved to dispose of many extra calories beyond what we need to live. Rats, among other species, have a far greater capacity to cope with excess calories than we do because they have more of a dark-colored tissue called brown fat. Brown fat helps produce a protein that switches off little cellular units called mitochondria, which are the cells' power plants: they help turn nutrients into energy. When they're switched off, animals don't get an energy boost. Instead, the animals literally get warmer. And as their temperature rises, calories burn...

Author: /time Magazine | Title: Why Exercise Won't Make You Thin | 8/9/2009 | See Source »

...Because rodents have a lot of brown fat, it's very difficult to make them obese, even when you force-feed them in labs. But humans - we're pathetic. We have so little brown fat that researchers didn't even report its existence in adults until earlier this year. That's one reason humans can gain weight with just an extra half-muffin a day: we almost instantly store most of the calories we don't need in our regular ("white") fat cells...

Author: /time Magazine | Title: Why Exercise Won't Make You Thin | 8/9/2009 | See Source »

...this helps explain why our herculean exercise over the past 30 years - all the personal trainers, StairMasters and VersaClimbers; all the Pilates classes and yoga retreats and fat camps - hasn't made us thinner. After we exercise, we often crave sugary calories like those in muffins or in "sports" drinks like Gatorade. A standard 20-oz. bottle of Gatorade contains 130 calories. If you're hot and thirsty after a 20-minute run in summer heat, it's easy to guzzle that bottle in 20 seconds, in which case the caloric expenditure and the caloric intake are probably a wash...

Author: /time Magazine | Title: Why Exercise Won't Make You Thin | 8/9/2009 | See Source »

...will feel greater entitlement to eat a bag of chips during that lazy time after we get back from the gym. This explains why exercise could make you heavier - or at least why even my wretched four hours of exercise a week aren't eliminating all my fat. It's likely that I am more sedentary during my nonexercise hours than I would be if I didn't exercise with such Puritan fury. If I exercised less, I might feel like walking more instead of hopping into a cab; I might have enough energy to shop for food, cook...

Author: /time Magazine | Title: Why Exercise Won't Make You Thin | 8/9/2009 | See Source »

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