The best diet plan for overall health may not cost a thing.

A new ranking of diets by U.S. News & World Report gives top honors for best overall diet to the DASH (Dietary Approaches to Stop Hypertension) diet.

Originally developed by the National Heart, Lung, and Blood Institute to lower blood pressure, the diet plan is available free online. The DASH diet is low in saturated fat, cholesterol, and total fat and  emphasizes fruits, vegetables, and fat-free or low-fat milk and milk products.

DASH wasn't created as a way to drop pounds, but as a means of combating high blood pressure. The federal government, which funded the research behind DASH, doesn't even call it a diet—it's an "eating plan."

Weight Watchers won best weight loss diet as well as easiest to follow and best commercial diet.

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