Tryptophan is an essential amino acid that the body cannot produce on its own, meaning it must be obtained through diet. It plays a crucial role in the production of proteins and is a precursor to important substances like serotonin, a neurotransmitter that helps regulate mood, sleep, and appetite. Foods rich in tryptophan include turkey, chicken, dairy products, nuts, and seeds. Once consumed, tryptophan is converted into 5-hydroxytryptophan (5-HTP) and then into serotonin. This process can be influenced by various factors, including the presence of other amino acids and carbohydrates. Adequate levels of tryptophan are important for overall health and well-being.