1991-2009年中国9省区50-79岁中老年居民维生素C摄入状况及变化趋势

Trend on vitamin C intake among Chinese population aged 50-79 years in 9 provinces, from1991 to 2009

目的分析中国9省区50-79岁中老年居民的维生素C摄入状况及变化趋势。方法利用“中国居民健康与营养调查”项目中连续3天24小时个人膳食回顾调查的数据，分析1991、1993、1997、2000、2004、2006和2009年中国9省区50-79岁健康中老年居民维生素C摄入状况及其变化趋势。结果7轮共调查50-79岁中老年人24321人，其中男性11739人（48.3％），女性12582人（51．7％）。农村居民平均维生素C摄人量均高于同年份的城市居民，1991-2009年城市男女性中老年居民维生素C摄人量分别增加了8．7mg和10．2mg，而农村男女性该年龄人群分别下降了12．1mg和11．8mg。农村居民来源于深色蔬菜的维生素C的摄入量男性下降15．1mg、女性下降13．9mg，而城市男女性居民同等来源的维生素C均有一个缓慢上升又缓慢下降的过程。来源于浅色蔬菜的维生素C的量基本保持平稳。除1997年外，中国南方地区中老年居民维生素C摄入量显著高于北方地区居民（P〈O．01）。维生素C摄入量达到中国居民营养素膳食参考摄入量的比例分别为19．8％-30．4％（城市男性）、31．1％-43．9％（农村男性）、15．9％-24．9％（城市女性）、26．4％-38．1％（农村女性）。结论中国50-79岁城乡居民维生素C摄人量出现不同的变化规律，城乡居民维生素C摄人量的差异日益减小，蔬菜和水果的摄入量仍然不足。

Objective To analyze the trend of dietary vitamin C intake and its food sources among Chinese population aged 50-79 years old in 9 provinces, from 1991 to 2009. Methods Data on twenty-four-hour dietary recall from China Health and Nutrition Survey （1991,1993,1997,2000, 2004,2006 and 2009） was used to identify the trends in vitamin C intake among Chinese population aged 50-79 years old. Results Totally, 24 321 adults were assessed among 7 round surveys, including 11 739 males （48.3%） and 12 582 females （51.7%）. From 1991 to 2009, the intake of vitamin C was reduced by 12.1 mg and ll.8 mg in rural male and female respectively; and the intake of vitamin C increased by 8.7 mg and 10.2 mg in urban males and females, respectively. Intake of vitamin C from the dark-color vegetables decreased by 15.1 mg and 13.9 mg in rural males and females, and it was increased first then decreased in both urban males and females. Vitamin C from the light-color vegetables kept stable during the 18 years. The intake of vitamin C in the southern residents aged 50-79 year-olds was significantly higher than that of the northern residents （except for 1997）. The proportion that vitamin C intake reached to Chinese RNI were 19.8%-30.4% （urban males） , 31.1%-43.9% （rural males） , 15.9%-24.9% （urban females） , and 26.4%-38.1% （rural females） respectively. Conclusion The present study indicated that the changing of vitamin C intake was different between urban and rural residents aged 50-79. The amount of vitamin C intake between urban and rural residents was gradually getting closer. However, the intake of vegetables and fruit was not sufficiency.