A small study shows that dietary cocoa flavanols — also known as molecules in chocolate — reverse age-related memory decline in people aged 50 to 69. But before you guzzle M&Ms, know that volunteers had to consume "staggering amounts" of the brain-boosting compounds. What's more, most chocolate bars have flavanols removed during manufacturing.

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Image: Mars, Inc.

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DISCUSSION

You'd have to eat 25 chocolate bars a day to get 900 milligrams of flavanols, the amount we used, which is a bad idea.

Or four glasses a day of CocoaVia in milk.