Turkey contains vitamins B-6 and B-12, niacin, choline, selenium and zinc. The dark meat of turkey tends to contain more vitamins and minerals, but also has more fat and calories.
You may have heard of the amino acid tryptophan, said to be the cause of all the napping after a big Thanksgiving dinner. While it is true that turkey contains tryptophan, it is not in an amount high enough to induce sleep. In fact, all meats contain tryptophan. Eating turkey at Thanksgiving should not make you any more drowsy than eating a pork chop on an ordinary Tuesday evening.
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