Do thin groups (Asians or religious Jews etc...) eat a special diet that makes them skinny?

The only explanation I have for skinny Asians is that their culture humiliates bigger people so it's either lose weight or never get married, never have friends and get hated by everyone in your family. There is no food in the Chinese diet that I believe makes you skinny.

Do thin groups (Asians or religious Jews etc...) eat a special diet that makes them skinny?
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