title: Heterogeneous associations of insoluble dietary fibre intake with subsequent glycosylated Hb levels among Chinese adults with type 2 diabetes: a quantile regression approach.
abstract: Dietary fibre intake has been suggested to reduce blood glucose levels in diabetic patients, particularly when glycosylated Hb (HbA1c) levels are high. In the present study, we used a quantile regression (QR) approach to characterise the possible heterogeneous associations of dietary fibre intake with HbA1c levels in Chinese diabetic patients. A total of 497 diabetic patients participated in the baseline survey in 2006 and in the follow-up survey in 2011, both of which were conducted in Pudong New Area of Shanghai, China. Structured in-person interviews were conducted to collect information on demographic characteristics and lifestyle factors. Dietary intake was assessed using a validated FFQ. Blood samples were collected during the interviews for biochemical assays. QR models were used to examine the heterogeneous associations of dietary factors with HbA1c levels. A significant marginal association of insoluble dietary fibre intake with subsequent HbA1c levels was observed only when the HbA1c level was over 6·8%. The associations appeared to be greater when the quantile levels of HbA1c were higher. The coefficient estimates were -0·174 (95% CI -0·433, -0·025) at the quantile of 0·60, -0·200 (95% CI -0·306, -0·008) at 0·70, -0·221 (95% CI -0·426, -0·117) at 0·80, and -0·389 (95% CI -0·516, -0·018) at 0·90. A similar pattern was observed for the associations of dietary glycaemic index (GI) value with HbA1c levels. In conclusion, the present results indicate that the associations of insoluble dietary fibre intake and GI value with subsequent HbA1c levels depend on glycaemic control status in Chinese diabetic patients. More studies are required to confirm our findings.
authors.affiliation: Department of Biostatistics,School of Public Health, Fudan University,138 Yi Xue Yuan Road,Shanghai200032,People's Republic of China.
authors.forename: Ziwen
authors.initials: Z
authors.lastname: Tan
authors.affiliation: Pudong New Area Centers for Disease Control and Prevention,3039 Zhang Yang Road,Shanghai200136,People's Republic of China.
authors.forename: Xiaonan
authors.initials: X
authors.lastname: Ruan
authors.affiliation: Department of Epidemiology and Community Medicine,Faculty of Medicine, University of Ottawa,451 Smyth Road,Ottawa,CanadaK1H 8M5.
authors.forename: Yue
authors.initials: Y
authors.lastname: Chen
authors.affiliation: Pudong New Area Centers for Disease Control and Prevention,3039 Zhang Yang Road,Shanghai200136,People's Republic of China.
authors.forename: Junyi
authors.initials: J
authors.lastname: Jiang
authors.affiliation: Pudong New Area Centers for Disease Control and Prevention,3039 Zhang Yang Road,Shanghai200136,People's Republic of China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Zhou
authors.affiliation: Pudong New Area Centers for Disease Control and Prevention,3039 Zhang Yang Road,Shanghai200136,People's Republic of China.
authors.forename: Hua
authors.initials: H
authors.lastname: Qiu
authors.affiliation: Department of Biostatistics,School of Public Health, Fudan University,138 Yi Xue Yuan Road,Shanghai200032,People's Republic of China.
authors.forename: Guoyou
authors.initials: G
authors.lastname: Qin
authors.affiliation: Department of Epidemiology,School of Public Health, Fudan University,138 Yi Xue Yuan Road,Shanghai20032,People's Republic of China.
authors.forename: Wang Hong
authors.initials: WH
authors.lastname: Xu
mesh_terms: D000368:Aged; D001786:Blood Glucose / Q000032:analysis; D002681:China; D003924:Diabetes Mellitus, Type 2 / Q000097:blood / Q000178:diet therapy*; D004043:Dietary Fiber / Q000032:analysis / Q000627:therapeutic use*; D005260:Female; D005500:Follow-Up Studies; D006442:Glycated Hemoglobin / Q000032:analysis*; D038321:Glycemic Index; D006801:Humans; D006943:Hyperglycemia / Q000517:prevention & control*; D008019:Life Style; D008297:Male; D008875:Middle Aged; D012044:Regression Analysis; D015203:Reproducibility of Results; D012995:Solubility; D011795:Surveys and Questionnaires
chemical_list: D001786:Blood Glucose; D004043:Dietary Fiber; D006442:Glycated Hemoglobin; C517652:hemoglobin A1c protein, human