But according to new data released by U.S. News and World Report, one regimen reigns superior.
The eating plan doesn't discourage drinking small amounts of alcohol - such as a glass of red wine for women and two glasses for men.
To that end, she said the top three diets are all similar in their food content, and all can be healthy eating regimens.
The diet emphasizes healthy food sources, including fruits, vegetables, whole grains, skinless poultry and fish, and nuts and legumes.
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Judges voted on 41 diets and ranked them in nine categories, including Best for Weight Loss and Easiest to Follow. The trendy ketogenic diet (also known as the keto diet), which is very high in fats but low in carbohydrates, moved up to the second-best plan for weight loss.
"These diets that are consistently top performers are scoring well, from nutrition to helpfulness, ease, ability to help prevent chronic conditions and more", Haupt said. The DASH diet had been ranked as the No. 1 overall diet by U.S. News and World Report for the previous eight consecutive rankings.
The DASH diet, made up of low-sodium and healthful foods, was originally started by the National Heart, Lung, and Blood Institute (NHLBI) as a diet to help reduce blood pressure. The Mediterranean diet has been praised for its health benefits for decades. Even those who didn't stick to the diet perfectly but followed it "moderately well" reduced their risk of Alzheimer's by about a third, the researchers found.
The WW Freestyle program was launched in 2017 and builds off the company's signature SmartPoints system, which assigns every food and beverage a point value, based on its nutrition.