[ELI5] Why do we loose muscle mass if we stop training?

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I know that muscles are a good protein source and if we don’t eat enough protein our body will take it from our muscle mass.

However, regardless of how good you eat, after a year or so with no training you will see a reduction in size.

I’ve also noticed that to maintain current muscle size you don’t really need to keep intensive training, as long as you keep active and use said muscles and eat properly you won’t lose muscle mass.

So why is it that your body gets rid of muscle mass if you don’t use it even with proper eating?

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3 Answers

Anonymous 0 Comments

Your body is made to survive in a world where resources are scarce. So it doesn’t want to waste resources maintaining fitness you don’t need. It’s not just that it’s scavenging protein, it’s that maintaining larger muscles, more aerobic capacity, etc. requires resources even if you’re not using them.

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