Alisa Sunness, a nutritionist at University of Wisconsin Health, who was not involved in the ranking, said that highest rated diets encourage the same types of eating habits.“They all support a higher intake of fruits and vegetables, lean protein and heart healthy fats and whole grains,” she said. “The diets are using foods with minimal added fats and sugars and using foods in the natural form, and naturally those foods are going to be nutrient dense.”