Fit for Life is a iet and lifestyle promoted by the American writers Harvey Diamond and Marilyn Diamond, which stems from the principles in Natural Hygiene. As the title of the original 1985 book suggests, Fit for Life claims that one can lose excess body weight and maintain good health via long term dietary and lifestyle practices, rather than short term dieting. In the Fit for Life book series many dietary principles are recommended including eating only fruit in the morning, eating predominantly "live...high-water-content" food (as per the raw food diet), and if eating animal protein to avoid combining it with complex carbohydrates (such as bread, rice, or pasta). Tony Robbins promotes the Fit for Life principles and veganism to increase energy levels in his book Unlimited Power. The original Fit for Life book was on the New York Times Best Seller list and the books in the series have sold a total of over 12 million copies worldwide.