The biggest weight loss happened in the first five months of the diet — low-fat and Mediterranean dieters lost about 10 pounds, and low-carbohydrate dieters lost 14 pounds.
By the end of two years, all the dieters had regained some, but not all, of the lost weight. The low-fat dieters showed a net loss of six pounds, and the Mediterranean and low-carbohydrate dieters both lost about 10 pounds.
Another article about this study has more information:
For people with cholesterol problems, the low-carb diet seemed best; for those at risk for diabetes, the Mediterranean diet provided more health benefits.
"The take-home message should be that we should abandon the idea that low fat diets are the number one way for people to lose weight –- it wasn’t the best diet, it can be helpful for some people, but overall I think the first choice should be the Mediterranean or the low carb," he said.