eli5: why is it that fatter/bigger people in general have an easier time gaining strength and putting on muscle than skinny people?

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This is not the place to give any measurements, so I’ll just say I was fat 7 months ago and I’m not anymore.

I put on a lot of muscle mass while losing quite some fat, so I can lift rather heavy (on my own perspective), but when I mock my friends about lifting more than them even though they’ve been training for years they all go “well, you used to be fat” or “that’s easier for you because you were bigger” and I have come to understand that’s just how it works because of the Internet too, but I don’t really know why.

I don’t know if it’s the language causing a misunderstanding here, but when I say “mock” I mean we joke with each other playfully in a way that everyone’s comfortable with.

In: Biology

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Anonymous 0 Comments

Your friends probably don’t have a real mechanism in mind, and also don’t mock your friend, you jerk, but it probably reflects genetics. People who are genetically predisposed to be skinny usually have a concurrent “resistance” to putting on muscle mass. Similarly, people who can put on fat also tend to put on muscle. This is genetic though not well understood – it’s not clear the same genes govern adding both muscle and fat, or if they’re just strongly correlated, or if the body “tracks” weight without regard to whether it’s fat or muscle.

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