There is one reason we gain weight: because we take in more calories that we burn. Period.
Running: there can be some small deviations, but roughly figure on 100 calories per mile ran. So, even at a constant 49 miles a week, you are talking about burning an extra 700 calories a day; or roughly 6-7 small pieces of fruit extra.
Frankly, as an ex 320 lb. person (and I am only 6 feet tall; 5 marathons since, between 3:38 and 4:28), I don't find it useful to use running to control my weight. If I do that, I become tempted to do extra miles when, say, I should be tapering or resting an injury.
So, the way I see it: I get help for my eating disorder so I CAN run. I don't ever run so I can eat more.
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