Dr. John A. McDougall is an American physician and nutrition expert, primarily known for his advocacy of a low-fat, starch-based vegan diet as a means to prevent and treat a variety of chronic illnesses. Born on May 17, 1947, McDougall became particularly well-known following the publication of his book "The McDougall Plan," which outlines his dietary recommendations. His approach emphasizes whole, plant-based foods and eliminates animal products, oils, and highly refined products. McDougall's philosophy is based on the idea that proper nutrition can not only prevent but also reverse many chronic diseases, and he has conducted several studies and clinical trials to support his claims. In addition to his published works, McDougall has delivered numerous lectures, conducted wellness programs, and created educational materials to promote his message of health through a starch-centered diet. His work has influenced many people's dietary choices and has contributed to the ongoing discussion about the impact of diet on health.