Consumer Reports has come out with its picks for best diet plan and best diet book. The Volumetrics Eating Plan by Barbara Rolls, a professor in the nutritional sciences department at the University of Pennsylvania was named the diet winner based on results from clinical studies. In the book category The Best Life Diet by fitness expert Bob Greene, and endorsed by Oprah, earned top marks. The diet includes fitness advice and offers tips for portion control.

Weight Watchers and Jenny Craig both received good ratings as diet plans, and The Abs Diet and You on a Diet received high marks for their practical and easy to follow exercise plans. Other diets did not fair so well however – The Ornish Diet and Atkins Diet were placed near the bottom because they were considered restrictive and excluded foods that are considered to be beneficial for good health.

Consumer Reports reviewers tended to favor diet plans and books that featured low-fat and low-calorie foods, healthy fats, sustainable weight loss, practical and effective exercise programs, recipes and portion control advice. The results of the study appear in the June issue of Consumer Reports.