Model twins turned animal activists Shane and Sia Barbi have just released their second diet book, "The Eco Anti-Diet Book.

The book teaches people to wean themselves from animal products to achieve a healthy, fit and slim body with a raw vegan diet. You can buy it on

All proceeds go to the animal charity Sea Shepherd. For more information, visit

And for more fun facts about the Barbi Twins, read their profile -- including how they gained international notoriety when a 13-year-old Prince William once said he had a crush on them!