But when its competitors are out of the way, it floods the brain, where it's converted to serotonin. Serotonin is a neurotransmitter that reduces pain, decreases appetite, produces a sense of calm and, in large quantity, induces sleep. Research has shown that dieters tend to become depressed about two weeks into a diet, about the time their serotonin levels have dropped due to decreased carbohydrate intake. For the most beneficial effects of carbohydrates and protein, eat them separately. Eat protein first, then go lightly on the carbohydrate if want to stay alert.
Caffeine can be an effective antidepressant.
Despite its bad rap, caffeine can do some good. For mild cases of depression which don't need medical attention, a little caffeine can be an effective antidepressant. It has the added benefit of remaining effective without an ever-increasing dosage daily to achieve the same effect. Folic acid is also an important counter to depression. Folic acid deficiency has been linked to depression in clinical studies.