The other major inhibitory neurotransmitter, serotonin, is deemed to be the master neurotransmitter. Serotonin imbalance is one of the most often cited contributors to depression and other mood disorders. It is also intimately tied to many biological processes such as sleep, appetite, pain, digestion, and generalized well-being. Serotonin is critical to feelings of self-worth and happiness and helps protect against both depression and anxiety.
Sustain levels of high stress, lack of sleep, poor nutrition, inflammation, genetic mutations, and certain prescription medications can slowly erode your levels of serotonin leading to depression, worry, insomnia, obsessive thoughts, compulsive behaviors, carbohydrate cravings, PMS, and exaggerated response to pain.