I'm not terribly knowledgeable in any of what I'm about to say but I just read that Heavy Water (Deuterium Oxide) is safe to drink in small amounts but you can't live off of it because it causes chemicals processes in your body to slow down; due the bonds between deuterium and oxygen being stronger.

I immediately had a thought of, "if heavy water makes it so it takes more energy for chemical reactions in your body to work. would drinking an amount of heavy water that isn't* deadly every day help with weight loss in people?"

I thought this because if it takes more energy to do things at the chemical level, you would end up burning more energy just simply existing.. idk maybe I'm dumb