Why are some people so thin?

Is it genetics, illnesses, or diet? Most Americans are overweight. Why are certain people still thin?

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SW-User

Americans overweight? But I thought white people were obsessed with diet and food control. Most Americans I have seen are really thin.

Kingfish · 31-35, M

All Americans are white?

Thanos · 31-35, M

Its one of the most obese countries

SW-User

Some are but some are just plain fat! :/