咖啡因对健康成人糖耐量的影响

Effect of caffeine on glucose tolerance of healthy adults

目的:观察口服400 mg咖啡因对正常成人糖耐量的影响。方法:采用单盲、安慰剂对照的随机临床研究。46位年龄在25～40岁的健康成人在4周观察期内需戒饮茶,咖啡,可口可乐或巧克力,并写下知情同意书。观察期结束后,随机分为两组分别服用1周咖啡因或安慰剂,进行葡萄糖耐量测试。结果:在前2 h,两组受试者血糖值正常且相似,但到第3,4 h,口服咖啡因组受试者与空白对照组比较,糖耐量曲线明显左移,血浆胰岛素水平略有增加。结论:健康成人口服咖啡因有降低血糖的作用,且伴有胰岛素水平轻微升高的依赖作用。

Objective： To investigate the effect of 400 mg oral caffeine on glucose tolerance. Methods： In a single-blind random clinical study, 46 healthy adults aged 25 ~ 40 years were treated with oral caffeine or placebo after getting their informed consents. They were abstained from coffee, tea, chocolate and cola for 4 weeks before testing. A 75 g oral glucose tolerance test （OGTT） was performed one week after taking caffeine or placebo. Results： The blood glucose curve was normal in all subjects, and was similar in the two groups until the second hour. In subjects taking caffeine, a shift in the curve towards the left was detected at the 3rd and 4th hours in comparison to those taking the placebo. Blood insulin levels were increased at 3rd and 4th hours after taking caffeine. Conclusion： Caffeine can reduce blood glucose levels in an insulin-dependent manner.