Diets that distinguish between "good carbs" and "bad carbs," are not an effective way of controlling blood sugar levels, a new study suggests.

Although made popular by the South Beach Diet and others, the glycemic index has never been fully embraced by most dietitians and remains a point of debate among scientists.

Now, diabetes researcher Elizabeth Mayer-Davis of the University of South Carolina says the use of the index should be ended altogether in favor of more traditional methods of losing weight and reducing the risk of diabetes - eating less and exercising more.

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