> How is the body burning the same calories with increased physical activity? As someone who runs marathons, the answer to “how does the body burn the same cal

> How is the body burning the same calories with increased physical activity? As someone who runs marathons, the answer to “how does the body burn the same calories with increased activity” is: It doesn’t. You will feel a marathon metabolically no matter what. And if you don’t eat like an absolute monster that day, you’re literally going to feel insatiable hunger for multiple days until you get those calories back. Feeling hungry when your stomach is so full that you can’t take another bite is quite an experience I’ll tell you that. And yes, your grocery bill does get higher when training for a marathon. It's very noticeable.