Which amino acid is a precursor to serotonin?

Tryptophan is the correct choice as it serves as the precursor to serotonin, a neurotransmitter that plays a crucial role in regulating mood, sleep, and appetite. Tryptophan, an essential amino acid, cannot be synthesized by the body and must be obtained through diet. Once ingested, it undergoes several biochemical transformations: it is first converted into 5-hydroxytryptophan (5-HTP) and then further converted into serotonin.

This process highlights the importance of dietary intake of tryptophan-rich foods, such as turkey, cheese, and nuts, in influencing serotonin levels, which can impact overall mental health. Understanding the role of tryptophan in serotonin synthesis is vital in holistic nutrition, as it underscores the interplay between diet, neurotransmitter production, and emotional well-being.