"Some people can pack away thousands of calories a day and be fine" They are almost certainly not packing thousands of calories a day, everyday. Most of these

"Some people can pack away thousands of calories a day and be fine" They are almost certainly not packing thousands of calories a day, everyday. Most of these people who you see eating a lot occasionally probably have very controlled and disciplined diets most of the time (whether that control comes easily to them or with great struggle is a different matter). But it is simply not true that you can eat at significant net caloric surplus _regularly_ without gaining weight.