Serotonin evolved as a metabolic regulator, not primarily as a 'happiness chemical'.

“he concludes that serotonin is actually largely a downer and him and this lady the clinician at the University of Oxford are saying the primary effects of Serotonin are actually as a metabolic regulator so what's your Authority really does it inhibits sort of like the entire also the first relationship Cascade predominantly in the brain and you're getting a situation where you basically like zombified I don't I don't have a better way better word to describe it you're really not reacting to your environmental stimuli whether they be good or bad right”