In the list of the world’s best diets, there is the DASH diet that has been the best for a number of years. Doctors say that it’s the most effective diet that can strengthen one’s health. According to the doctors of the National Institutes of Health, the DASH diet scores 3.3 points out of 5 in the “Weight Loss Effectiveness” category and 4.5 points out of 5 in the “Health Usefulness” category.