Glycemic response to amylopectin rich starch present in common fasting foods of India.

摘要

In India potato and sago are permitted to be eaten during periods of religious fasting. The relative glycaemic and insulin responses to these fasting foods were determined in normal healthy adult volunteers. Specifically, the postprandial glycaemic response to boiled potato and sago khichdi (a dish of sago, ground peanuts and boiled potato fried in vegetable oil) was compared with that of an equal quantity of bread (reference). 5 clinically healthy participants ate 100 g of either of the test foods or white bread, and their blood glucose and insulin responses were recorded at fasting (>10 h overnight fast; 0 min) and at 30, 60, 90 and 120 min after eating. Results show that for both potato and sago khichdi a peak glucose response was produced 30 min after eating, and glucose levels were returned to baseline within 60 min. The higher amylopectin content of these test starchy foods facilitates faster absorption of glucose from the gastrointestinal tract; thus, the total area under the curve (AUC) glycaemic response to potato and sago khichdi was significantly lower than that of bread (P < 0.05). The total AUC insulin response to potato (P < 0.05) and sago khichdi was also lower than that of bread. The results are discussed in terms of the physicochemical properties of sago and potato.