There’s some debate as to how well your body handles tryptophan, and a study from the Massachusetts Institute of Technology found that getting it from high-protein foods can work against you, because protein can prevent tryptophan from entering your brain. But when you combine high-protein foods with carbs, the insulin your body produces in response to the carbs makes it easier for tryptophan to break through your brain’s barriers. So think oatmeal with bananas and almonds, for a real sleepy snack, or whole-grain cereal with organic milk.
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