Ludwig says that restricting carbohydrates over the long term may be hard for many people. If you're trying to lose weight, "you can get a jump start with a low-carb diet, but over the long term, a low-glycemic index diet may be better than severely restricting carbohydrates."
"The low-glycemic index diet seems to be the happy medium," says Cara Ebbeling, associate director of the Obesity Prevention Center. "It didn't slow metabolism as much as the low-fat diet, and it didn't seem to have some of the negative effects on cardiovascular disease risk."
On a low-glycemic index diet, you would avoid highly processed carbs such as white bread, white rice, many snack foods, prepared breakfast cereals, sugary desserts and sugary beverages, she says.