The Effects of Dietary Fibre on Glucose Tolerance in Healthy Males

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Abstract
Previous studies have showed that addition of non-absorbable carbohydrate (NAC) to test meals decreases the glucose and insulin response in normal and diabetic subjects. These studies apparently used bran in the basic test meal without a knowledge of the effect of bran itself or of the added NAC alone. Bran alone, pectin alone, guar alone and pectin with guar were studied. Guar alone added to the test meal significantly lowered blood glucose at 90 min. Pectin alone did not have a significant effect. Pectin and guar together resulted in a blood glucose lower at 30 min and greater at 12 min. No significant changes in insulin response were noted. NAC apparently alters the glucose response to a given meal, but the extent to which this occurred in the present study was less than in previous studies. The differences may reflect synergism between bran and other NAC to lower blood glucose response after a meal.