What those British researchers found was that the lowest combined rate of heart disease, diabetes, strokes, and even death occurred in men whose BMI was between 20 and 23.9. Once your BMI gets higher than that, disease and death rates start rising about 10 percent per index point - or about every six to eight pounds for most people (depending on height).

"But, I'm a bodybuilder. Does this really apply to me?" Yes. You can get away with a higher BMI, but even for you, a BMI of over 30 isn't healthy.