Experts ranked the diet poorly in heart-health, ease of use, and overall impact on health.
The diet is taken from popular eating lifestyle of countries that border the Mediterranean Sea, with an emphasis on olive oil, fish, beans, nuts, fruits and vegetables. Those two diets tied for the 38th spot out of 41 diet plans reviewed by U.S. News and World Report's panel of medical experts.
The DASH (Dietary Approaches to Stop Hypertension) diet was created to help manage blood pressure, but experts say it has many overall health benefits, helping it nab the number 2 spot on the best overall diets list.
The flexitarian diet encourages people to try alternative meat options, like tofu, but leaves room for flexibility if you can't quite fully give up meat.
And no, unfortunately, there is still no magic fix for losing weight, but there are certain diets that have been shown to be more successful. It's more flexible than fully vegetarian or vegan diets.
WW's Freestyle program applies points values to foods, with higher points for foods high in saturated fats and sugars, and lower points for foods with high levels of protein.
Other diets at the bottom of the list included the Dukan diet, the Body Reset Diet and the Whole30 diet. Although created to help people lose weight, experts say its focus on healthier living makes it a smart overall diet to follow.
But the diet topping any list isn't necessarily the best diet for you.