Let me phrase it like this. If you consume less calories than you expend, you are going to lose weight as the body will used stored chemical energy to survive.

Let me phrase it like this. If you consume less calories than you expend, you are going to lose weight as the body will used stored chemical energy to survive. I can recommend the BBC Horizon documentary "Why Are Thin People Not Fat" Homework: Exactly where does they weight you lose go?