[moi2388]

Whilst that is true, in neither case will it extract the full kcal, since that was calculated by completely burning the food (in a calorimeter). If you burn more than 100kcal you will not gain weight no matter what. You might still get fatter, but your total mass cannot increase if you burn more calories than you consume unless you violate conservation of energy.

[mariusor]

I am so weirded out that almost nobody seems to acknowledge that calorie numbers have no actual meaning with the way digestion processes food in a human body. Relying on food consumption advice that's based on calorie numbers and math is invariably wrong, the only way it might happen to have any meaningful impact is because low numbers mean lower overall quantities.

Also the way calories are "counted" in exercise is absolutely bogus for individuals because it rarely takes into account their physiology and basically uses made up numbers of various exercise types.