system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is it so much harder to gain muscle than lose it?
gpt
Because muscle is expensive for your body. Muscle needs fuel-it needs calories/energy to function, and it needs a lot of it. But your body only needs a set amount of muscle, and anything beyond that point is waste. Your body still thinks food is scarce and every day is a fight for survival. Why would it keep on extra muscle when muscle is both expensive and unneeded? Fat on the other hand, serves as protection/backup and spends a lot les energy than muscle, thus why your body wants to keep it/keep making it. That's why you need to 'trick' your body into thinking it 'needs' that extra muscle, by engaging in resistance training and feeding it adequate supply of energy.