This is an informational update on three important nutrition topics: methylation, food allergy, and the gut/digestion. Dr. Gaby is internationally recognized as an expert in nutritional therapy. He is past-president of the American Holistic Medical Association and gave expert testimony to the White House Commission on Complementary and Alternative Medicine on the cost-effectiveness of nutritional supplements. He has written numerous scientific papers in the field of nutritional medicine. Dr. Gaby is the author of the renowned textbook, Nutritional Medicine, which is now in its second edition. Find more on him at https://doctorgaby.com/.