Trend on vitamin C intake among Chinese population aged 50-79 years in 9 provinces, from 1991 to 2009 / 中华流行病学杂志

ABSTRACT

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 11.8 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.