[tekla]

As it turns out, the body obeys thermodynamic laws and you will lose weight if you eat less than you burn even if its all starches and sugars.

[aredox]

Except that the body is not a passive black box and can adapt its burn rate - which is partially uncontrollable (meaning: not related to physical exercise, e.g. thermal regulation)

[kevviiinn]

Burn rate for a sedentary 75kg human is 1600-2000 kcal/day iirc. It can't go down to 500 without dropping active tissue