See my other response to sibling comment. TLDR: weight gain is not from body using less energy but from your regulating machine being put out of balance. Body

See my other response to sibling comment. TLDR: weight gain is not from body using less energy but from your regulating machine being put out of balance. Body on caffeine will still use more calories, but your brain on poor sleep will make worse choices and you will eat more just to offset unhappiness.