Vitamins have many functions and sources. A common function is to be part of an enzyme involved in a metabolic reaction. The brain is particularly metabolically active. In 2002, the Institute of Medicine estimated that 130 grams of carbohydrate were needed daily to provide sufficient glucose for the brain to function. Thinking requires energy. So it is not surprising to read that increasing one’s intake of vitamins and minerals might impact metabolism and the brain.
In a randomized, double blind, placebo-controlled, parallel-groups study of 97 healthy females, Kennedy and colleagues studied the effect of increasing doses of multivitamins/minerals