A small new study shows that successful dieters had an abundance of a bacteria called Phascolarctobacterium, whereas another bacteria, Dialister, was associated with a failure to lose weight.
A meta-analysis found that people on vegetarian diets lost around 4.4 pounds more than the control group (who had no change in diet), while those who went vegan dropped 5.5 pounds more.
Marcus Butt/Ikon Images/Corbis
The Mediterranean-like DASH and the plant-centric Ornish eating plan topped this year's rankings of diets by a panel assembled by U.S. News & World Report.
Gillian Blease/Getty Images/Ikon Images
The 7-Day Color Diet: An attempt to get people to eat more fruits and vegetables, this diet requires followers to eat foods of just a single color each day. It ends with a day in which you "eat the rainbow," so to speak. Here's Gonot's cheeky take on orange day.
Stephanie Gonot/Courtesy of the photographer