<human>:  Who is the main character in the movie, ‘Forks Over Knives’?
<bot>: That would be the lead character, Caldwell B. Esselstyn. He is a surgeon who decided to adopt a vegan diet and lifestyle to see if it would help him reverse his heart disease. He was a pioneer in the field of plant-based nutrition and wrote a book about his experiences called Prevent and Reverse Heart Disease.