Stomach fat is considered more metabolically active than lower body fat. While that may sound good, as this fat breaks down easily, the result is a release of substances called cytokines, which have been linked to cardiovascular disease, insulin resistance and diabetes. In fact, research on mice reported in 2008 revealed that belly fat boosts inflammation and is linked with hardening of the arteries – known to increase the risk of heart attacks.

But scientists think lower body fat, like that around the hips and thighs, produces beneficial hormones that protect against these diseases, though more research is needed to firm up this expectation.

In addition, this lower body fat also traps fatty acids. While this long-term storage can make it tricky to slim down your butt and thighs, it's healthier for you if some fat stays put...