Popcorn is 'the king' of snacks states a rather casually phrased report from the American Chemical Society meeting in California. It's a big ball of grain, and has more antioxidants than some fruits and vegetables. But don't just replace fruit and vegetables with popcorn, as this will not work out well in the long run. Do replace potato chips and nachos and giant boxes of chocolate with popcorn. Antioxidants are good for killing viruses in the blood and preventing certain cancers. This article also claims that they fight aging, but prefaces this remark with the dubious sounding: "people say..".
Well these people say that you should eat more popcorn.
Source: Toronto Star