In a feeding trial involving dikanut (an African viscous fibre) and cellulose (a particulate fibre), diabetic rats were maintained for 4 weeks on each of the test fibres. The levels of digestive and membrane-bound enzymes of the intestine, and hepatic glycolytic enzymes were determined. The effect of the supplements on intestinal morphology was also assessed. The two types of dietary fibre caused a general reduction in the levels of all the intestinal enzymes assayed with the effect of dikanut supplementation resulting in more drastic reductions. Evidence was obtained for a marked alteration in the intestinal morphology. It was concluded that the reduced absorption of glucose resulted in its lowered level in the blood and urine. The disruption of the mucosal membrane may also curtail the absorption of glucose. On the other hand, the activities of hepatic glycolytic enzymes became elevated to efficiently utilize the low substrates reaching the liver. The dietary fibres caused a shift away from the depletion of glycogen by the diabetic rat to synthesis of the storage polysaccharide. The long-term effects of the several adaptive responses resulting in lowered blood glucose from feeding these dietary fibre supplements to the diabetic rat requires further research.