Nutrients in foods are precursors to neurotransmitters and the more precursors present in the food you eat, the more or less of a certain neurotransmitter is produced. However, because foods are composed of more than one nutrient, it's how these various nutrients interact that also has an affect on your emotional condition.
Eating the right kinds of foods not only helps you lose weight, but also improves your moods. Besides putting a smile on your face because the scale goes down, there are also biological reasons why the right foods make you feel better, both physically and emotionally.
Meals should contain a balance of "healthy" carbohydrates, proteins, fats, and liquids in order to provide the necessary nutrients to be healthy.
Healthy Carbohydrates include many bright, colorful and green, leafy vegetables, some dark, colorful fruits, beans, and some specific organic whole grains (but, not wheat bread!).
Healthy Proteins include cold-water fish, nuts/seeds, legumes, fermented soy, organic dairy, lean animal meats (i.e. chicken, turkey, organic beef), wild animal meat (i.e. bison, ostrich, deer).
Note: If you are concerned about the mercury in fish, eat smaller fish or take an Omega-3 supplement.
Healthy Fats include plant oils, and the oil in nuts/seeds and cold-water fish. But avoid clear vegetable oils and canola oil!
Healthy Liquids include filtered water, raw vegetable juices; some raw fruit juices; specific teas; green smoothies and, some of the organic bottled juices.