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Noted British psychiatric researcher Malcolm Peet conducted a provocative cross-cultural analysis of the relationship between diet and mental illness. His primary finding was a strong link between high sugar consumption and the risk of both depression and schizophrenia.
There are at least two potential mechanisms through which refined sugar intake could exert a toxic effect on mental health. First, sugar actually suppresses activity of a key growth hormone in the brain called BDNF. BDNF levels are critically low in both depression and schizophrenia.