[trendia]

The authors only looked at weight and BMI, and not bodyfat % or lean mass, which are much better indicators of health than weight or BMI alone.

Someone who is 6' and 200 lbs could either be a body builder or a coach potato, and they'd have the same BMI.

[jaravis]

Sure -- but body fat won't change much with aerobic activity (such as running) without also impacting weight.