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What is serotonin, and in which foods does it occur?

Serotonin is a neurotransmitter produced in your body; it does not exist in foods. However, there is literature that supports the role of certain nutrients involved in its production. The body thus produces serotonin by itself. These nutrients include omega-3 fatty acids, tryptophan (an amino acid), magnesium and zinc.

A neurotransmitter is a compound used by nerve cells in their communication. This means that nerves "talk" to each other or send signals using serotonin as one of the conduits. Certain nerves use serotonin while other nerves may use different neurotransmitters.