This study was carried out on healthy adults aged from 20 to 34. Two experiments: drinking glucose and eating moon cakes containing isomalt were taken by these subjects and at least one week apart.

The results showed that: The level of serum insulin after eating the moon cakes with isomalt was significantly lower than after drinking glucose at 45 and 60 minutes after taking the products (38.83±28.92 and 63.1±31.97mU/l respectively; p<0.01 and p<0.05). The difference in serum insulin level of after-before eating the moon cakes with isomalt was significantly lower than that of drinking glucose at 45 and 60 minutes after taking the products (34.03 ± 25.74 and 58.62 ± 30.90mU/l  respectively; p< 0.005 and p< 0.05). Serum insulin IAUCs of eating the moon cakes were significantly lower than drinking glucose at 45, 60 and 90 minutes as well as after 120 minutes of taking the products (528.1 ± 340.6 vs. 785.9 ± 465.6; 503.1 ± 340.6 vs. 890.7 ± 465.6; 982.6 ± 655.9 vs. 1423.5± 738.2 and 3410.3 ± 2112.1 vs. 4479.8 ± 2104.8 mU.minut/l; p< 0.05; p<0.001 and p<0.05).

Conclusion: The moon cakes contained isomalt do not raise the insulin excretion as much as glucose and can be considered as a low GI product.