A survey of expert reviews in U.S. News & World Report ranked Weight Watchers as the best weight loss plan, followed by the Biggest Loser Diet, Jenny Craig and the Raw Food Diet. The metrics used to make these determinations measured both short- and long-term weight loss.
WebMD advises dieters to choose long-term diets that emphasize exercise and healthy life-style choices over fad and crash diets designed for rapid, short-term weight loss. For these reasons, a report from Harvard Health Publications also recommends Weight Watchers and Jenny Craig. According to the report, the Weight Watchers point system encourages dieters to eat foods with high protein and fiber and avoid foods high in sugars and fat. The diet also includes an exercise component. Jenny Craig encourages the same healthy eating while also providing staff members to customize the plan to an individual's specific health needs.
The survey in U.S. News & World Report gave the lowest rankings to the Paleo Diet, the Acid Alkaline Diet, Glycemic-Index Diet and the Dukan Diet. According to the review, these diets shared a reliance on unproven scientific claims and an emphasis on quick weight loss that is unlikely to last past the initial diet phase.