Psychology Today: Are You What You Eat?:
"...it's tempting to dwell on relationships between a particular food and a corresponding mental benefit or mood boost. But it's an overall healthy eating pattern that yields results, not any one food, warns Larry Lindner, executive editor of Tufts University's Health and Nutrition Newsletter. A diet rich in fruits, vegetables and dairy, for example, can blunt cognitive deficits in most people. But to those who say that eating a piece of bread raises serotonin levels and makes you happy, Lindner responds, "If carbohydrates caused happiness, ours would be the happiest nation in the world."

Each of us processes food in a unique way, too. "Some people have different metabolic rates," says neuroscientist Chandan Prasad, editor-in-chief of the journal Nutritional Neuroscience. "Even rats show individual effects in food studies." He points to the burgeoning field of genomics, where scientists are searching for links between genetic makeup and varieties of response to diet.

With these caveats in mind:"[more]