Beneficial Effects of High Dietary Fiber Intake in Patients with Type 2 Diabetes Mellitus
Manisha Chandalia, M.D., Abhimanyu Garg, M.D., Dieter Lutjohann, Ph.D., Klaus von Bergmann, M.D., Scott M. Grundy, M.D., Ph.D., and Linda J. Brinkley, R.D.
Background The effect of increasing the intake of dietary fiberon glycemic control in patients with type 2 diabetes mellitusis controversial.
Methods In a randomized, crossover study, we assigned 13 patientswith type 2 diabetes mellitus to follow two diets, each forsix weeks: a diet containing moderate amounts of fiber (total,24 g; 8 g of soluble fiber and 16 g of insoluble fiber), asrecommended by the American Diabetes Association (ADA), anda high-fiber diet (total, 50 g; 25 g of soluble fiber and 25g of insoluble fiber) containing foods not fortified with fiber(unfortified foods). Both diets, prepared in a research kitchen,had the same macronutrient and energy content. We compared theeffects of the two diets on glycemic control and plasma lipidconcentrations.
Results Compliance with the diets was excellent. During thesixth week of the high-fiber diet, as compared with the sixthweek of the ADA diet, mean daily preprandial plasma glucoseconcentrations were 13 mg per deciliter (0.7 mmol per liter)lower (95 percent confidence interval, 1 to 24 mg per deciliter[0.1 to 1.3 mmol per liter]; P=0.04) and mean daily urinaryglucose excretion was 1.3 g lower (median difference, 0.23 g;95 percent confidence interval, 0.03 to 1.83; P=0.008). Thehigh-fiber diet also lowered the area under the curve for 24-hourplasma glucose and insulin concentrations, which were measuredevery two hours, by 10 percent (P=0.02) and 12 percent (P=0.05),respectively. The high-fiber diet reduced plasma total cholesterolconcentrations by 6.7 percent (P=0.02), triglyceride concentrationsby 10.2 percent (P=0.02), and very-low-density lipoprotein cholesterolconcentrations by 12.5 percent (P=0.01).
Conclusions A high intake of dietary fiber, particularly ofthe soluble type, above the level recommended by the ADA, improvesglycemic control, decreases hyperinsulinemia, and lowers plasmalipid concentrations in patients with type 2 diabetes.
Source Information
From the Department of Internal Medicine (M.C., A.G., S.M.G., L.J.B.) and the Center for Human Nutrition (A.G., S.M.G.), University of Texas Southwestern Medical Center, Dallas; the Department of Veterans Affairs Medical Center, Dallas (M.C., A.G., S.M.G.); and the Department of Clinical Pharmacology, Rheinische Friedrich-Wilhelms-Universität, Bonn, Germany (D.L., K.B.).
Address reprint requests to Dr. Garg at the Center for Human Nutrition, University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd., Dallas, TX 75390.
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