Otherwise known as the "real reason French women stay skinny," the
Dukan Diet, a low-carb, protein-based plan, came in at No. 7 on the list. Although the Dukan Diet isn't new, it soared in popularity after it was rumored that Kate Middleton used it to get in wedding-photo shape for her royal nuptials. It's somewhat restrictive, but
still features some pretty healthy foods, including kale, beetroot and salmon.
