For what it's worth, U.S. World & News Report annualy assembles a panel of diet and health experts (http://health.usnews.com/best-diet/experts) to judge a variety diets. In 2011 and 2012, the paleo diet ranked as the worst. The criteria were health, weight-loss, and ease of following. In terms of nutrition, safety, rating for diabetes, and rating for heart health, it scored a 2/5, 2.3/5, 2.1/5, and 2/5 respectively.