Eli5: When you go to sleep weighing a certain amount and wake up weighing less. Where did that weight go?

Question

Eli5: When you go to sleep weighing a certain amount and wake up weighing less. Where did that weight go?

In: Biology

Answer 1

In just one night? From sweating. If you lose weight over a long time, it is because your metabolism converts fat into co2 which you breath out