In general, the more food we eat in its natural state - without additives - and the less it is refined, the healthier it will be for us. Food can affect the mind, and deficiencies of certain elements in the body can promote mental depression.
Holland gets by on a total of four food additives; we have over 1,400.
We are eating hybridized and genetically modified (GMO) foods full of antibiotics, hormones, pesticides, and additives that were unknown to our immune systems just a generation or two ago. The result? Our immune system becomes unable to recognize friend or foe - to distinguish between foreign molecular invaders we truly need to protect against and the foods we eat or, in some cases, our own cells. In Third World countries where hygiene is poor and infections are common, allergy and autoimmunity are rare.
Stop eating 'dead' foods: junk, fried, and fast foods, as well as processed carbs. They’re loaded with sugar and other additives. The more live foods we eat (fruits and vegetables), the more alive we feel. The more dead foods we eat. . . well, you get the idea.