The origin of brain disease is in many cases predominantly dietary. Although several factors play into the genesis and progression of brain disorders, to a large extent numerous neurological afflictions often reflect the mistake of consuming too many carbs and too few healthy fats.
David Perlmutter (2014). “Grain Brain: The Surprising Truth about Wheat, Carbs, and Sugar - Your Brain's Silent Killers”, p.27, Hachette UK