Abstract

Rice with double mutation of starch synthase IIIa and branching enzyme IIb (ss3a/be2b) has much higher amounts of apparent amylose and resistant starch (RS) than usual varieties. In this study, we conducted two randomized, single-blind, crossover trials to investigate the effect of single ingestion of two processed foods composed of ss3a/be2b mutant rice on postprandial blood glucose and insulin response in healthy adults, compared to those of usual cultivar. In trial 1, of ingestion of rice crackers, the incremental area under the curves of glucose (IAUCglc) and insulin (IAUCins) in RS group was significantly lower than in the control group. In trial 2, of the ingestion of cooked rice, IAUCglc in the RS group was significantly lower than in the control group. These results showed that the ss3a/be2b-mutant rice cracker and cooked rice having high RS can attenuate postprandial blood glucose and insulin response.

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