If you don't have a weight problem, you have more than your diet or your gym to thank. You also owe a nod to your leptin gene. And while you're at it, tip a hat to your MC4 receptors and your PC1 enzymes and your POMC peptides. Hard to figure out the role this alphabet soup of stuff plays in helping keep you thin? Don't feel bad. It's all new to scientists too.
Nutritionists know that the two great pillars of weight control--diet and exercise--can't be all there is to avoiding obesity. Why else could two otherwise healthy people eat identical...
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