Am I Destined To Be This Size?

You know better than to expect life to be fair. But still, it's enough to drive anyone crazy: Some people seem to be able to eat anything they want and never gain weight.

About 50% of weight variation stems from genetics, according to Rooth Loos, a professor of public health at the Icahn School of Medicine. We'll also hear from Yale neuroscientist Dana Small.

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