Home > Encyclopedia of Mental Disorders > Nutrition and mental health

Nutrition and the brain

A person's food intake affects mood, behavior, and brain function. A hungry person may feel irritable and restless, whereas a person who has just eaten a meal may feel calm and satisfied. A sleepy person may feel more productive after a cup of coffee and a light snack. A person who has consistently eaten less food or energy than needed over a long period of time may be apathetic and moody.

The human brain has high energy and nutrient needs. Changes in energy or nutrient intake can alter both brain chemistry and the functioning of nerves in the brain. Intake of energy and several different nutrients affect levels of chemicals in the brain called neurotransmitters. Neurotransmitters...