Given the choice, most people will equate being slim with being healthy. But this isn't always the case -- some people are thin despite living an unhealthy life, while some are 'fit but fat.'

It's important to look at more than the number on the scale when assessing someone's health, according to this article from Diet Blog. Case in point: a study published in the Journal of the American Medical Association shows that fitness and lifestyle is a better indicator of someone's health than how they look.

I think these findings are spot on -- I know thin people who live on diets of chemicals and get no exercise, and I know so-called chubby people who work out regularly and eat well. Anyway, no matter your size, it's a good reminder that true health can't be faked.