TryptophanL-tryptophan is one of the essential amino acids and is used by the body to produce serotonin. This hormone is vital in helping control your mood and sleep! Tryptophan is an amino acid that can't by produced by the body so it has to come into our bodies through our diets. A deficiency in tryptophan can lead to increased stress, anxiety, and feelings of depression. Incorporating foods rich in tryptophan can help prevent such a deficiency. The foods below are all rich in tryptophan and worth incorporating into your diet! So check your Metabolic Balance meal plan and incorporate the foods that are good for you into your meals after the strict phase!