Serotonin has the reputation of a happiness hormone. It is associated with good mood, calm and well-being. The biologist Ray Peat saw serotonin far more critically. He described it as a stress signal that, in excess, can promote inflammation and accelerate ageing. In this article you will learn what serotonin does in the body, how Peat came to his assessment and what he recommended for everyday life.
What serotonin does in the body
Serotonin is a messenger substance formed from the amino acid tryptophan. Only a small part is found in the brain. By far the largest share is produced in the gut and stored in the blood platelets. There, serotonin influences gut movement, blood clotting, the width of blood vessels and inflammatory reactions. In addition, a lack of serotonin in the brain is no longer the accepted explanation for depression. The former “serotonin hypothesis” is now viewed in a more nuanced way in research.
Why Ray Peat viewed serotonin critically
Peat looked at serotonin mainly in its role outside the brain. He described it as part of the body's stress response, similar to histamine and oestrogen. In his view, a permanently elevated serotonin level can intensify inflammatory processes, impair blood flow and slow energy metabolism. From this he concluded that too much serotonin could contribute to ageing. This view is a minority opinion. His statements can be found in Ray Peat on serotonin.
Serotonin, inflammation and ageing
In ageing research, chronic low-grade inflammation is considered a factor that accompanies ageing. This is known as “inflammaging”. Peat saw serotonin as one of the messengers that promote such inflammation. As an example, he cited situations in which a lot of serotonin is released from the gut, for instance with disturbed digestion or a bacterial burden in the gut. Hence his focus on easily digestible foods. Peat's thoughts on inflammation are collected under Ray Peat on inflammation.
What Peat recommended for everyday life
Easily digestible diet
Peat preferred foods that place little strain on the gut: ripe fruit, dairy products, cooked vegetables, meat and gelatine. He viewed large amounts of hard-to-digest fibre critically. A simple option for him was a raw grated carrot, which he recommended for its fibre to support digestion.
Reduce stress
Since Peat understood serotonin as part of the stress response, he recommended the same principles as for an active metabolism: regular meals, enough sleep, daylight and a well-functioning thyroid. More in the article Thyroid and stress.
Nutrients
He named vitamin B6, magnesium and an adequate supply of protein as a foundation. Much of this can be covered through meat, dairy products and organ meats.
Important note
If you take medication that affects serotonin levels, such as certain antidepressants, never stop or change it on your own. Always discuss changes with your doctor.
Conclusion
Serotonin is more than a happiness hormone. Most of it acts in the gut and in the blood. Ray Peat saw an excess of serotonin as a stress signal that can promote inflammation and accelerate ageing. This view is disputed but offers a different perspective on the well-known hormone. His practical recommendations focus on an easily digestible diet, stress reduction and an active metabolism.
