Consumer Reports is out with a study of the best diet plans out there. Here's how they stack up:

Jenny Craig came out on top in the Consumer Reports test. The report shows that 92 percent of participants were able to stick with a Jenny Craig program for two years while maintaining an average weight loss of more than 8 percent of their initial body weight.

The others making the Consumer Reports list ranked from best to least: Slimfast (shakes and bars), Weight Watchers (moderate carbohydrate, fat, and protein), the Zone (high-protein, moderate carbohydrate), Ornish (high carbohydrate, low-fat), and Atkins (high-protein and fat). The study is based on nutrient content, weight loss -- both short- and long-term -- and dropout rates, with data collected from published studies.