Foods that contain the amino acid tryptophan, including mung beans (yum!), lobster, turkey, asparagus, sunflower seeds, cottage cheese, pineapple, tofu, spinach, and bananas, might improve mood and well-being. Tryptophan is the same element that makes you sleepy after eating Thanksgiving dinner. Wanna know what food makes me happy? Peanut butter. And peanut butter ice cream.