When you lose weight, how does the fat leave the body….

Question

I’ve heard you literally poo and wee it out

In: Biology

Answer 1

Fat is made up of long carbon chains. Energy the body uses for work is made when you use up a carbohydrate (ex. A molecule of glucose, broken down from stored fat) and create molecules of ATP (the stuff used as energy) and waste products like CO2 (the carbon portion) and water. The CO2 leaves by breathing out.

Poo is generally made up of broken down red blood cells and things we can’t digest (among other stuff like bacteria) and pee is mainly water and ammonia (with other things like potassium).