Dr. Smithson became plant-based 15 years ago after his wife had a health crisis. As his family began to eat better, he saw his weight and cholesterol drop, and he knew he was getting healthier. That shift led him to look into the science behind a plant-based, whole food diet, and he learned he had been unaware of how much one's health can improve with a diet change. Now his practice emphasizes produce over pills, and he sees big changes in his patients as they move toward a more plant-based lifestyle. He still practices traditional internal medicine, but he asks his patients to change their diet and exercise habits in order to add more years to life and more life to years.