16 December 2014 - MedicalXpress - Healthy eaters, ignore glycemic index: Clinical trial shows no beneficial effects on heart disease, diabetes risk

The glycemic index is a measure of how quickly foods containing carbohydrates, such as fruits, cereals and baked goods, raise glucose levels in the bloodstream. Conventional wisdom says that high glycemic index foods like bananas and pasta are "bad" for heart health and may increase diabetes risk. But in a clinical trial reported Dec. 17 in the Journal of the American Medical Association, researchers at the Johns Hopkins University School of Medicine and Harvard Medical School found little evidence to support these claims.

Study volunteers followed carefully planned diets high or low in carbohydrates and with high or low glycemic index scores. Tests tracked the volunteers' blood pressure, cholesterol levels and sensitivity to insulin at the beginning and end of each diet. The results showed little difference between high and low glycemic index foods, says study co-director Lawrence J. Appel.

"Get back to the basics that most people already know," he says. "Don't drink sugar-sweetened drinks. Try to eat fruits, vegetables and whole grains. Try to avoid sweets, salt, and foods high in saturated and trans fats. People who follow these principles will reap the benefits."