in man's environment 1000s of years ago, it would be advantageous to eat high sugar foods if you found them (they would have been rarer)
thus people who had the taste for them had an advantage over who had taste buds that thought they tasted bad
I looked this up a long time ago, and yeah, it's a survival thing. While we're talking about this, I also read somewhere that a huge reason why people like bright colors (say, red, blue, green, yellow, etc.) more than other colors (dark colors in general, etc.) is because liking certain colors attracted people to fruit. Also, companies like McDonald's and Burger King take advantage of that and have bright colors all over their restaurants because that makes us crave food (IIRC).
Just some random things I've heard.
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Zachnorn - <D http://img841.imageshack.us/img841/4503/qrcode857546.th.png