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I guess the classic example is the kid who won't eat his broccoli

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Just a quick note on this one, I heard from UK panel show QI that the reason that children start off disliking vegetables is because to a young pallet these can taste very bitter. This has evolved as it stops kids munching on potentially poisonous plants. (This was not said by god-like Stephen Fry so it may not be 100% accurate)

Edited to add: Also with the food thing, obviously from an evolutionary point of view the most important thing is survival, at times when food could be scarce we should obviously shovel down as many calories as possible. Now that society's changes have suddenly (on an evolutionary scale) altered our environment we've been left with the archaic desire of high sugar/fat foods.