中国居民膳食生物素平均每日摄入量评估

目的采用食物分类计算法评估中国居民膳食生物素平均摄入量。方法 448种食物,采用微生物法测定生物素含量后,根据2002年中国居民营养与健康状况调查报告分为31类,计算各类食物算术均值和几何均值,乘以相应的食物消费量加和计算城乡居民和2岁以上各年龄段人群生物素平均摄入量。结果全国居民总体生物素摄入量(算术均值)为40.0 g/d,城乡范围36.8~48.9 g/d,几何均值计算结果比算术均值约低9 g/d。30岁前生物素摄入量随年龄增加,到30～45岁时达到最高;其中女性(38.7 g/d)低于男性(43.8 g/d);45岁后随老龄化生物量摄入逐渐下降,70岁时女性仅为31.2 g/d(算术均值)。结论我国城乡居民膳食生物素平均摄入量基本可以达到中国营养学会推荐营养素适宜摄入量(AI),育龄妇女和老年妇女生物素摄入量相对偏低。

EVALUATION OF THE AVERAGE DAILY DIETARY INTAKES OF BIOTINS IN CHINESE RESIDENTS

Objective To estimate the average dietary intakes of biotin using food classification calculation in Chinese.Method Four hundred and forty-eight individual foods with biotin content measured by microbiological method were divided into 31 groups.The daily intakes of biotin in urban and rural residents over 2 years old were calculated,based on the arithmetic mean and geometric mean contents of biotin in different food groups,multiplied by the amount of foods intake reported by China National Nutrition and Health Survey 2002.Results The average daily intake of biotin by arithmetic mean for overall residents were 40.0 g/d,ranged from 36.8 to 48.9 g/d.The results calculated by geometric mean showed 9 g/d less.For different age stages,the daily biotin intakes increased with age and topped around 30-45 years old.The average intake was less in women(38.7 g/d) than men(43.8 g/d).The biotin intake was only 31.2 g/d by women over 70 years old.Conclusion The average intake of dietary biotin in Chinese residents basically achieved the adequate intake(AI) recommended by Chinese Nutrition Society.Focus on relative lower intake of biotin in childbearing aged women,as well as the elderly should be much more concerned.