Critical Reasoning (CR) | Re: In humans, ingested protein is broken down into amino acids, all of wh

In humans, ingested protein is broken down into amino acids, all of which must compete to enter the brain. Subsequent ingestion of sugars leads to the production of insulin, a hormone that breaks down the sugars and also rids the bloodstream of residual amino acids, except for tryptophan, Tryptophan then slips into the brain uncontested and is transformed into the chemical serotonin, increasing the brain's serotonin level. Thus sugars can play a major role in mood elevation, helping one to feel
...

---