Body Atlas

Healthy Muscle Habits · Muscles

How fast do muscles waste away?

Muscle is expensive, so the body sheds what it isn't using.

The simple answer

Muscle costs energy to maintain, so your body treats it as strictly need-to-have. Stop using it and it starts disappearing — measurably within weeks of immobility, and dramatically in the extreme case of prolonged bed rest or spaceflight.

Go deeper

There's more: muscle is expensive, so the body sheds what it isn't using. The full explanation — and the interactive version you can tap and quiz yourself on — lives in the app.

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