Weight Watchers

This popular points-counting diet helps dieters drop pounds and keep them off. In experts’ ratings, Weight Watchers bested all other ranked diets for both short-term and long-term weight loss. That doesn’t guarantee it will work for everyone, of course. Its average rating of “moderately effective” for long-term weight loss reflects the difficulty dieters have in staying on the wagon, even when using the best weight-loss diet available.