Why are these Asians so skinny?

Today I was at an East Asian Buffet and I saw a crowd of tall Korean guys at the buffet. They were so tall and thin, they looked like extremely thin k-pop fashion models, and they ate twice as much as all the fat people at the buffet.

I used to know a 90 pound woman who ate 5000 calories for every meal.

How do they do it?

Why are these Asians so skinny?
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