Since years my diet is essentially composed of meat, nuts, black chocolate and fatty dairy products, and very often work strenuous jobs while fasting the entire day. Most "knowledge" people possess about our diet is bs and spread by the food industry. You wouldn't believe how many times I've heard "but you need [insert fuits, veggies, fiber, carbs, vitamins, x amount of meals a day etc.] ". If everything people told me were true I'd be an out of shape diabetic person with scurvy, a fatty liver and whatnot, instead of the healthiest shape I've ever been in my entire life.