Why do some people gain weight fast, but others can't gain any weight?

I tried gaining weight, but I really can't. 😔

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Victorian · 56-60, F

Could it be genetics?

Manfredthemanic · 18-21, M

@Victorian Yes, I know. But some people can gain weight by rating badly or a lot and I can't. 🙈

Fluffybull · F

@Manfredthemanic You're probably the weight you're meant to be, then. As long as you're fit and healthy. It's probably better for you than being overweight.