Objective To investigate the effect of dietary fiber on carbohydrate metabolism of healthy volunteers after the intake of corn starch meal. Methods Totally 12 healthy volunteers aged (25. 8 ± 5. 3) years were enrolled in this study, and they were equally randomly divided into two groups (group A and group B). This was an open, randomized, cross-over, and two-period study, and each period lasted for one day. In period 1, the subjects in group A received fiber-free corn starch and group B received high-fiber corn starch (containing 16 g dietary fiber). In period 2, the two groups are crossed. There was a one-week wash-out time between the two study days. On the study day, breath samples of fasting and 0. 5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 5.0, 6.0,7. 0, 8. 0 hours post meal were collected to measure13 CO2. Results The delta over baseline at 0. 5, 1.5, 2. 0,2. 5, 3. 0, 4. 0 hour after test meal in fiber free group and in high fiber group were 0. 79, 2. 03, 2. 57, 2. 86,3. 02, 3. 18 and 0. 16, 1. 33, 1.77, 2. 10, 2. 34, 2.42, respectively (the P value was 0. 014, 0. 014, 0. 011,0.018, 0. 036, and 0.020, respectively). Peak concentration of delta over baseline of fiber free group and high fiber group was 3.18 and 2. 56 respectively, there was no significant difference between two groups (P > 0. 05) ,peak time of the group at 4. 0 hour and 3. 5 hour respectively, showed significant difference (P = 0. 032). The cumulative percentage dose recovered 0. 5-6. 0 hours after test meal in fiber-free group and in high-fiber group were 0.41, 1.46, 3.15, 5.50, 8.28, 11.30, 14.42, 17. 62, 23. 65, 28. 78 and 0. 09, 0. 55, 1.61, 3.22,5.23,7.53, 10.09, 12.68, 17.60, 22.27 respectively (the P value was 0.014, 0.018, 0.018, 0.014, 0.013,0.014, 0.018, 0.020, 0.025, and 0.044, respectively). However, there was no significant difference 6.0 hours after meal (P > 0. 05 ). Conclusion The dietary fiber used in this study can delay the absorption of carbohydrate 6. 0 hours within intake without influencing its total absorption amount.%目的 观察复合膳食纤维对摄入玉米淀粉试餐后的健康受试者碳水化合物代谢的影响.方法 将12例健康志愿者采用随机表随机分为2组,每组6人.采用随机、开放、双周期、交叉设计.第一周期,一组接受无纤维玉米淀粉试餐,另一组接受高纤维玉米淀粉试餐(含膳食纤维16 g).采集受试者空腹及摄入试餐后0.5、1.0、1.5、2.0、2.5、3.0、3.5、4.0、5.0、6.0、7.0、8.0 h的呼气样本,进行"CO2的测定.受试者完成第1周期试验后,中间经过1周的洗脱期,两组受试者交叉,重复上述试验.结果 受试者摄人不同试餐后,无纤维膳食组第0.5、1.5、2.0、2.5、3.0和4.0小时13CO2高于本底的δ值变化分别为0.79、2.03、2.57、2.86、3.02和3.18,高纤维膳食组分别为0.16、1.33、1.77、2.10、2.34和2.42,无纤维膳食组高于高纤维膳食组,P值分别为0.014、0.014、0.011、0.018、0.036和0.020;无纤维膳食组13CO2高于本底的δ值变化峰值为3.18,高纤维膳食组为2.56,两组比较差异无统计学意义(P>0.05);无纤维膳食组达峰时间为4.0 h,高纤维膳食组为3.5 h,高纤维膳食组有明显延迟(P=0.032).无纤维膳食组0.5～6.0 h内各点的13CO2的累积回收率分别为0.41、1.46、3.15、5.50、8.28、11.30、14.42、17.62、23.65和28.78,高纤维膳食组分别为0.09、0.55、1.61、3.22、5.23、7.53、10.09、12.68、17,60和22.27,两组差异具有统计学意义,P值分别为:0.014、0.018、0.018、0.014、0.013、0.014、0.018、0.020、0.025和0.044.6.0 h以后13CO2的累积回收率两组比较差异无统计学意义(P>0.05).结论 本试验所用复合膳食纤维可以使6.0 h以内碳水化合物的氧化率降低,但对碳水化合物的总氧化率无影响.
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