Can good nutrition be an effective treatment for mental illness?

Millions of people in the United States are affected by mental illness — specifically, 1 in 5 adults and 1 in 6 youth experience mental illness each year — with anxiety disorders affecting 19.1 % of U.S. adults and, the most common, major depressive disorder affecting 8.3% of U.S. adults, according to the National Alliance on Mental Illness.