20. Mozzarella Cheese
Tryptophan is the first thing people think of when they hear tryptophan. There are other foods rich in amino acids besides turkey. Mozzarella is a good example of a food that is high in tryptophan. Tryptophan plays a major role in serotonin production, which improves your mood and your cognition. This is great news, and you should sprinkle some cheese on your salad or melt some in your toaster.