Aamir Khan: The reason is because Kiran [his wife] showed me a documentary about health. It basically presented good lifestyle habits. A U.S. doctor talked about the relationship between food and health of the body, and diseases, such as how healthy food affects the body, and the effects of non-vegan food, vegetarian food and vegan food. After watching the documentary, I understood a vegan diet is the most optimal diet of all. I would advise everyone follow a vegan diet.