Eli5 why are people saying muscle and fat weigh the same?

Question

So I keep seeing people say muscle and fat weigh the same because a lb of each is a lb. But surely a lb of anything is an lb? You need less muscle to reach an lb then you do fat, right?

In: 0

Answer 1

Yes, a pound is a pound. Muscle is more dense, so one pound takes less space than a pound of fat. A 250 pound athlete can fit into smaller clothes than a 250 pound couch potato.

Need context to know why you keep hearing people say that.