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In this instance, lore almost intersects with science. Turkey does contain tryptophan, an amino acid which is a natural sedative. But tryptophan doesn't act on the brain unless it is taken on an empty stomach with no protein present, and the amount gobbled even during a holiday feast is generally too small to have an appreciable effect. That lazy, lethargic feeling so many are overcome by at the conclusion of a festive season meal is most likely due to the combination of drinking alcohol and overeating a carbohydrate-rich repast, as well as some other factors:
Originally posted by kinglizard
Remember when the discussion turns to turkey making you sleepy it's the "tryptophan" in the meat.
Originally posted by snafu7700
and even more importantly to our men and women overseas and their families back home who are without them this holiday season.