Abstract
The objective was to compare the glycemic response among Beauregard orange sweet potato (SP), Pakistan White Star SP, commercial Caiapo (a dietary supplement from Japanese SP), and White Star skin. Cultivars had similar proximate analyses. Skin was higher in protein, fiber, and ash and lower in NFE than whole SP. Healthy and diabetic volunteers (20 each) were fed 50 g of carbohydrate from Glucose, White Star, White Star Skin, Beauregard, on alternate mornings. Rise in blood glucose (BG) 0–1 h was significantly greater for glucose than for SP in all subjects. There was a significant difference among the treatment means: intake of carbohydrate from White Star and Beauregard, and White Star skin (P < 0.01) resulted in significantly less rise in serum glucose than control. The White Star cultivar skin alone did not cause any observable rise in serum glucose in both people who had and did not have diabetes. Insulin rise seemed to follow the increased BG, rather than being causative. Glycemic response to SP can vary among cultivars within the root. Healthy and diabetic subjects’ data led to the same conclusions, although fasting BG was more than twice as high in diabetic subjects.
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