简述血糖指数的概念及临床意义。
血糖指数指餐后不同食物血糖耐量曲线在基线内面积与标准糖(葡萄糖)耐量面积之比,以百分比表示。其计算公式为血糖指数=某事物在食后2小时血糖曲线下面积/相等含量葡萄在食后2小时血糖曲线下面积×100血糖指数可作为选择多糖类食物的参考依据。在谷类主食中尽量选择血糖指数较低的品种,如莜麦面、荞麦面、玉米面等。
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