Serotonin is manufactured in the brain and the intestines, with 90% in the gastrointestinal tract. Serotonin is also located in the blood platelets and the central nervous system and influences many body and psychological functions. However, Serotonin cannot cross the blood-brain barrier and therefore Serotonin used in the brain must be produced there.
Serotonin Functions
Serotonin functions as a neurotransmitter, influencing both directly and indirectly the majority of brain cells. Serotonin assists in:
Serotonin and Sleep
Serotonin plays a role in sleep cycles and in wakefulness states. Serotonin is synthesized by the pineal glad to make melatonin, the hormone directly related to sleep.
Serotonin levels are lower in sleep than while we are awake and are at their lowest during REM (Rapid Eye Movement) sleep, the dream sleep. Neurons with Serotonin receptors are active during all stages of sleep until we reach REM stages, then Serotonin quiets. When Serotonin levels drop, acetylcholine (neurotransmitter) rises in the brain. This is why many on antidepressants have reduced dream sleep – the high Serotonin levels inhibit the increase in acetylcholine.
The Serotonin System is Very Complex
Serotonin is involved in a broad range of physiological and behavioral processes including cardiovascular regulation, pain sensitivity, appetite, sexual behavior, cognition, learning, mood and respiration. The Serotonergic system is a complex structure that is critical to address not only biological responses but challenges from the environment.
Altering this system chemically upsets a fine balance within the body. Increasing Serotonin with antidepressants can cause symptoms including diarrhea, nausea, vomiting, headaches, shivering, agitation, restless, confusion and uncoordinated movement. If Serotonin rises too high, dangerous symptoms including irregular heartbeat, seizures and trembling can indicate Serotonin Syndrome, a potentially fatal condition.
Natural Ways to Build Serotonin
Serotonin is an inhibitory neurotransmitter meaning is does not stimulate the brain. Adequate levels are necessary to balance any stimulating signals. Any stimulant medications or items like caffeine and sugar can cause a depletion of serotonin over time. Serotonin also regulates carbohydrate cravings, pain control, digestion, and is critical for proper sleep, so supporting natural Serotonin levels through a healthy diet is essential.
The following may naturally assist in the production of Serotonin:
Foods that have the highest concentrations of Serotonin:
Our bodies naturally use the precursors from foods to build Serotonin levels. Serotonin in its complete form cannot pass through the blood-brain barrier, so serotonin-rich foods must be included in our diet to provide the building blocks. How we eat affects or mood and our mood affects how we eat. A diet high in Folate also improves Serotonin levels.
Foods that provide the building blocks for Serotonin production are:
References:
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2077351/
http://www.clinchem.org/content/55/8/1578.full
http://www.medicalnewstoday.com/articles/232248.php
http://www.bu.edu/writingprogram/journal/past-issues/issue-5/mcclenathan/
https://www.madinamerica.com/2012/01/revising-the-history-of-the-serotonin-theory-of-depression-2/
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