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  Keto Diet Reviews Ratings reflect scores of 1 to 5 assigned to the keto diet in seven categories by nutritionists, specialists in diabetes and heart disease, and other diet experts on a ratings panel assembled by U.S. News. (See our  Best Diets methodology .) The Keto diet was among the lowest-ranked diets overall. Many of our experts expressed concerns about the diet’s emphasis on fat-rich foods. “This diet is fundamentally at odds with everything we know about long-term health,” one expert said. Below are the ratings in all categories and how the experts’ opinions broke down Short-Term Weight Loss   The keto diet performed the best in this category, with experts noting that the low-carb plan is generally a quick, effective weight-loss strategy. But one expert cautions that its effectiveness as a short-term diet doesn’t mean it’s a good idea. The Keto Diet is ranked #3  (tie)  in  Best Fast Weight-Loss Diets . Can I l...