The ancient intuition that food shapes feeling has found a biochemical address: serotonin, the neurotransmitter at the center of mood and well-being, is built in part from what we eat. Science has identified a handful of foods — among them poultry, eggs, fatty fish, nuts, seeds, and cheese — that supply the raw materials the body needs to sustain this chemistry. In a moment when mental health is a pressing collective concern, the kitchen offers not a cure, but a quiet and accessible form of participation in one's own neurological care.