Most women think of fat as the archenemy, the source of dimply thighs and unwanted muffin tops.
Useful? That's not a quality we attribute to fat.
Yet researchers say we have both brown and white fat, and the brown variety is metabolically active. This means brown fat burns calories and fights obesity and diabetes.
How do you get this "useful" fat? Exercise. Scientists say your daily sweat sessions alter your white fat, essentially "browning" it.
Converting fat from foe to friend: I like that idea.