Lack of proper nutrients, and toxicity from dioxins, PCBs, phthalates, bisphenol-a, and toxic metals such as mercury, lead, aluminum, fluoride, cadmium, and arsenic harm mental and physical health.  Mental health would be greatly improved if we screened for key nutrients and minerals and treated people with all nutrients.  If possible, please read Healing the Gerson Way by Charlotte Gerson at http://gersonmedia.com/product-category/gerson-therapy/ and Nutrient Power by William Walsh, PhD at http://www.walshinstitute.org/.  The Mensah Medical Center near Chicago at www.mensahmedical.com boasts an 85% cure rate for all mental problems such as anxiety, depression, attention deficit and hyperactivity disorder (ADHD), schizophrenia, and bipolar disorder by using targeted nutrient therapy alone and no pharmaceutical drugs.  We would do well to conduct a study in rural Alaska studying nutrient and mineral levels such as for vitamin D, needed minerals, and toxic metals and publish the results.