Low levels of these neurotransmitters result in depressed mood, fatigue, and poor concentration, whereas high levels can create agitation and anxiety. The brain synthesizes these neurotransmitters from amino acids, the building blocks of protein. Tryptophan is converted into serotonin, whereas tyrosine is the principal ingredient in dopamine and norepinephrine. Tyrosine will be converted into dopamine and norepinephrine. With only 3-4ounces of protein, you will feel energized, more alert and more assertive.
Carbohydrates enhance the absorption of tryptophan, which is converted into serotonin in the brain.
Within about thirty minutes of eating a carbohydrate snack, you will feel more calm and relaxed. The effects will last several hours. Despite the fact that serotonin is manufactured in the brain from tryptophan, found in protein-rich foods, a meal rich in protein actually lowers the blood level of tryptophan. Even a modest amount of protein will counteract the calming effects of carbohydrates. Here s why.