title: [Trends of the dietary fiber intake among Chinese aged 18 - 45 in nine provinces (autonomous region) from 1989 to 2006].
abstract: OBJECTIVE
  To analyze the status and trend of dietary fiber intake and its food sources among Chinese residents aged 18 - 45 years old in 9 provinces (autonomous region), from 1989 to 2006.
  
  
  METHODS
  Twenty-four-hour dietary recall data of three consecutive days from China Health and Nutrition Survey (1989, 1991, 1993, 1997, 2000, 2004 and 2006) were used. And the 18 - 45 years old subjects with complete information on dietary survey were included. The sample size of these 7 surveys were 5597, 5596, 5323, 5485, 5308, 4144 and 3889, respectively. The trends of dietary fiber intake and food sources by time and sex were studied.
  
  
  RESULTS
  From 1989 to 2000, the total of daily dietary fiber intake of 18 - 45 years old healthy residents decreased from 15.1 g/d to 11.6 g/d, insoluble dietary fiber intake decreased from 22.6 g/d to 17.8 g/d. In villages, from 1989 to 2000, the insoluble dietary fiber intake decreased 5.1 g/d in males and 5.2 g/d in females(13.2, 11.8 g in 2000, respectively;18.3, 17.0 g in 1989, respectively). In 2006, the insoluble dietary intake was 12.6 g/d in males and 11.2 g/d in females in villages. In cities, from 1989 to 2006, the insoluble dietary fiber intake was 9.4 - 11.8 g/d in males and 8.3 - 10.8 g/d in females. The total dietary fiber intake was 15.7 - 17.6 g/d in males and 13.5 - 16.4 g/d in females. The difference of insoluble and total dietary fiber intake between city and village was decreasing. In 2006, 70.6% (8.4/11.9) insoluble dietary fiber came from vegetables ((4.1 ± 3.1) g/d), wheat flour and its products ((2.6 ± 3.6) g/d), rice and its products ((1.7 ± 1.3) g/d).
  
  
  CONCLUSIONS
  Dietary fiber intake among Chinese aged 18 - 45 in 9 provinces (autonomous region) decreased from 1989 to 2006. Vegetables, wheat flour, rice and their products were the major food sources of insoluble dietary fiber.
authors.affiliation: Institute of Nutrition and Food Hygiene, Chinese Center for Disease Control and Prevention, Beijing 100050, China.
authors.forename: Hui-Jun
authors.initials: HJ
authors.lastname: Wang
authors.forename: Bing
authors.initials: B
authors.lastname: Zhang
authors.forename: Wen-Wen
authors.initials: WW
authors.lastname: DU
authors.forename: Ai-Dong
authors.initials: AD
authors.lastname: Liu
authors.forename: Ji-Guo
authors.initials: JG
authors.lastname: Zhang
authors.forename: Zhi-Hong
authors.initials: ZH
authors.lastname: Wang
authors.forename: Chang
authors.initials: C
authors.lastname: Su
authors.forename: Yu-Xia
authors.initials: YX
authors.lastname: Ma
authors.forename: Feng-Ying
authors.initials: FY
authors.lastname: Zhai
mesh_terms: D000293:Adolescent; D000328:Adult; D002681:China; D004043:Dietary Fiber; D005247:Feeding Behavior; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009749:Nutrition Surveys; D055815:Young Adult