You can be next. Both Jenny Craig and Weight Watchers focus on behavior re-education, practical meal planning and proper eating skills, according to the Colorado State University Extension. A vegetarian diet is one which excludes meat. Popular diet plans that severely restrict foods may leave dieters with unbearable cravings. However, many have features in common, such as high protein levels or avoidance of certain food groups.
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Overall, I looked at 4 more studies. Two of them showed weight loss of a few pounds over a period of 8 weeks (9, 10), but the other two showed no effect (11, 12). So… unfortunately, the weight loss effects appear to be both weak and inconsistent.