The quality, quantity, and make up of the bacteria in your gut determines your gut health and has enormous influence on your brain.
Dr. David Perlmutter examines this phenomenon in great detail in his new book, Brain Maker: The Power of Gut Microbes to Heal and Protect Your Brain-for Life.
Dr. Perlmutter is a board-certified neurologist and a fellow of the American College of Nutrition (ACN). Dr. Perlmutter has a clinic in Naples, Florida, and he's been very active in publishing his findings in peer-reviewed medical journals.
Grain Brain, his prior book, was on top of the New York Times bestseller list for 54