World's Best food (drink) - Water

Don't underestimate the power of a simple glass of water. Soaking up 91 ounces (women) or 125 ounces (men) a day keeps skin smooth and memory sharp, protects the joints and can even help you shed those couple extra pounds. 

Not to mention, the body couldn't perform a number of key processes without H20. "Water helps the body digest food, absorb nutrients from food and then get rid of the unused waste," according to experts from the Penn Instutute on Aging. They also point out you don't only have to drink it -- there is plenty of water in high-water-content foods like watermelon and cucumbers and in other liquids, too.

And did we mention it's the only food or drink with absolutely zero calories?
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