“Two handfuls of cashews is the therapeutic equivalent of a prescription dose of Prozac. Inside you, the essential amino acid L-tryptophan is broken down into anxiety-reducing, snooze-inducing niacin. Even more important, tryptophan is also made into serotonin, one of your body’s most important neurotransmitters.
Plenty of carbohydrates (starches) in your meals help tryptophan get to where it does the most good: in your brain. In order to cross the blood-brain barrier to get in, carbos are required. So cheese and crackers provides a better effect than the cheese standing alone. An egg or two on toast is better than just the egg. Beans, peas, and nuts already contain carbohydrate, so you are all set there.
Consider that five servings of beans, a few portions of peanut butter, or just one big handful of cashews provides one to two thousand milligrams of tryptophan, which will work as well as prescription antidepressants…”