The brain is made of billions of cells called neurons, which are responsible for nearly every human task, including thought, movement, vision, and emotional response. The brain contains the hypothalamus which works together with the pituitary gland (just beneath the brain) to regulate hormones involved in bodily rhythms, such as sleep, growth, reproduction, and metabolism.
The brain is very high in fat and cholesterol. 60% of the brain is made of fat, and 20% of that fat is the essential omega-3 fatty acid DHA, which keeps brain cells flexible. 25% of the body’s cholesterol is in the brain, where it is used to form myelin, the waxy wrapper that insulates nerve fibers.
35% of the brain is made of protein. Most of the brain’s neurotransmitters—the brain’s chemical messengers—are made from proteins, and include substances such as serotonin and dopamine. Carbohydrates make up only about 5% of the brain’s weight.
Important brain disorders include: Alzheimer’s disease, depression, epilepsy, bipolar disorder, Parkinson’s disease, ADHD, migraine, schizophrenia, addiction, brain tumors, Multiple Sclerosis, autism, eating disorders, restless legs syndrome, and anxiety.