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 hide caption

itoggle caption 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 hide caption

itoggle caption 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 hide caption

itoggle caption Stephanie Gonot/Courtesy of the photographer
Illustration by Tim Robinson for NPR

Front-loading your calories may help you lose weight. Gaelle Cohen/iStockphoto.com hide caption

itoggle caption Gaelle Cohen/iStockphoto.com