Weight

His brand of misinformation has already tarnished medicine. In the halls of Congress, he’d do much worse

What is living in your gut? It might depend less on your diet, exercise habits, weight and sex than you think, according to new findings. Our health is tied to trillions of organisms that live in and on us.

Not all fat people are metabolically equal. And a simple number like the body mass index (or BMI) does not take that key fact into account.