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目的营养素参考摄入量是营养学研究的基础。根据“2002年中国居民营养与健康状况调查”的数据显示,目前我国正常成年人膳食蛋白质参考摄入量偏高,需要重新评估。方法 9名健康成年女性分别摄入不同蛋白质水平膳食[0.75、0.82、0.89、0.97、1.05 g/(kg.d)],每个蛋白质水平持续6 d,在第6天时以13C-亮氨酸作为指示剂进行稳定性同位素代谢实验,计算标记亮氨酸的流量、氧化率和氧化产物产生率等各项动力学参数,通过建立蛋白质摄入量和呼气中13CO2产生率之间的二相回归方程,确定方程的拐点处即为蛋白质的平均需要量。结果青年女性平均需要量为0.85 g/(kg.d),平均需要量加上2个标准差得到推荐摄入量为0.97 g/(kg.d)。结论结合近年来全国营养调查成年女性的体重代表值推荐我国成年女性的每日蛋白质摄入量为55 g,该推荐量低于我国现行的成年女性蛋白质推荐摄入量。
The purpose of nutrient reference intake is the basis of nutrition research. According to the “2002 China Nutrition and Health Survey,” the data show that at present our normal adult dietary protein reference intake is high, need to re-evaluate. Methods Nine healthy adult women took different dietary protein levels [0.75, 0.82, 0.89, 0.97 and 1.05 g / (kg · d)] respectively, and each protein level continued for 6 days. On the 6th day, As an indicator of stability of isotope metabolism experiments, calculation of leucine flow labeling, oxidation rate and the rate of oxidation products and other kinetic parameters, through the establishment of protein intake and exhaled 13CO2 between the two phase Regression equation to determine the inflection point of the equation is the average protein requirement. Results The average requirement for young women was 0.85 g / (kg · d). The average requirement plus 2 standard deviations resulted in a recommended intake of 0.97 g / (kg · d). Conclusion According to the national nutrition survey in recent years, the body weight of adult women recommended adult Chinese women daily intake of protein of 55 g, the recommended amount is less than the current adult Chinese women recommended protein intake.