Basically, burning calories through exercise causes some people to eat more, but not everyone does, and a few people actually eat less. Alex Hutchinson discussed this point recently on his blog (1). Part of it depends on how much fat you carry-- if you're already lean, the body is more likely to increase hunger because it very much dislikes going too low in body fat. Most overweight/obese people do not totally make up for the calories they burn through exercise by eating more, so they lose fat. There is a lot of individual variability here. The average obese person won't lose a substantial amount of fat through exercise alone. However, everyone knows someone who lost 50+ pounds through exercise alone, and the controlled trials support that it happens in a minority of people. On the other side of the spectrum, I have a friend who gained fat while training for a marathon, and lost it afterward.
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