Thin AND fat?

We all know that person who looks like they work out without ever going to the gym. Although having such a body may seem like a blessing, it may actually be a curse.

Normal-weight persons who are sedentary and unfit are at much higher risk for mortality than obese persons who are active and fit.

That's right. Just because you're thin doesn't mean you're healthy. In fact, a large percentage of men and women with normal body mass indices were found to have dangerously high levels of internal fat.