GLYCEMIC INDEX AND GLYCEMIC LOADS OF VARIETY OF FRUITS: CLINICAL IMPLEMENTATION OF FRUITS' SERVING SIZE IN LOW GLYCEMIC LOAD DIET

摘要

Consuming fruits and vegetables as low glycemic index (GI) foods are recommended in the weight loss and also diabetic management. Recognition of GI of fruits in different regions enables us to develop and cultivate low GI fruits. To determine the GI of variety of fruits which are exportable in Iran, groups of 8 healthy nondiabetics male volunteers aged 20-28 within School of Medicine, randomly assigned to each of fruits including: apricots, prunes, cherries, bluberries, Golab apples, Green apples, Golden no-seed grapes and Red sultanas. GIs were calculated as the ratios of the incremental areas under these response curves to those for glucose ingestion. GIs of fruits were compared using repeated measure ANOVA anda testofwithin-subjects contrast to compare the mean GI of certain tested fruits. Mean GI of variety of fruits were 39 +-5,4l+- 6,50 +-6,34+- 7,29 +-4,28+- 6,48 +-6,49+- 7 respectively for Golab apple, Green apple, apricots, prunes, cherries, blueberries, Golden no-seed grapes and Red sultanas. The GIs were significantly different between the 8 tested fruits (P > 0.002 for overall effect). Serving size of blueberries, cherries, Golab apples, Green apples, prunes, and apricots were low glycemic load (GL) fruits while golden no-seed grapes considered medium (GL= 13) and Red sultans with GL = 23 had the highest GL among tested fruits. All tested fruits were low GIs. The tested fruits can be recommended for diabetics and weight loss management. Consumption of one servingsize sultanas will have high GL and is not suitable for diabetics.