Take avocados and peanuts, for example. Not too long ago they wore a big scarlet “F” for too much fat. Yet as peanuts and avocados sat languishing on many people’s bad-for-you lists, researchers discovered that the fat in these two foods, mostly the monounsaturated kind, is extremely good for the heart–and for health in general.

And the good news didn’t stop there. Researchers continue to uncover disease-fighting chemicals or new health roles for these foods.

CNN.com