John McDougall is a physician and author known for his work in promoting a plant-based diet. He advocates for a low-fat, starch-based diet that emphasizes whole foods, such as fruits, vegetables, grains, and legumes. His approach aims to improve health and prevent chronic diseases like obesity, diabetes, and heart disease. McDougall founded the McDougall Program, which offers educational resources and retreats focused on nutrition and lifestyle changes. He has written several books, including The Starch Solution, where he outlines his dietary philosophy and provides recipes. His work has influenced many individuals seeking healthier eating habits.