[KotOD]

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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)

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I've read the same thing previously. Kids won't eat asparagus, spinach and other bitter plants because it's an evolutionary response to avoid similar-tasting foods that will kill them.