Blueberries, pomegranates and strawberries get a thumbs-up from Kleiner, too, thanks to their high levels of antioxidants, which are critical for brain health and heart health.Even reduced-fat and fat-free milk, yogurt, cottage cheese, and other dairy products improve well-being because they???re high in tryptophan, which elevates concentrations of serotonin (your ???happy??? hormone) in the brain