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Dietary iron intake and body iron stores are associated with risk of coronary heart disease in a meta-analysis of prospective cohort studies.

Abstract

The link between iron intake as well as body iron stores and coronary heart disease (CHD) has been contentiously debated, and the epidemiologic evidence is inconsistent. We aimed to quantitatively summarize the literature on the association between dietary iron intake/body iron stores and CHD risk by conducting a meta-analysis of prospective cohort studies. PubMed was used to find studies published through June 2013 in peer-reviewed journals. Embase or a hand search of relevant articles was used to obtain additional articles. The pooled RRs of CHD incidence and mortality with 95% CIs were calculated by using either a random-effects or fixed-effects model, as appropriate. Twenty-one eligible studies (32 cohorts) including 292,454 participants with an average of 10.2 y of follow-up were included. Heme iron was found to be positively associated with CHD incidence (RR: 1.57; 95% CI: 1.28, 1.94), whereas total iron was inversely associated (RR: 0.85; 95% CI: 0.73, 0.999). Neither heme-iron nor total iron intakes were significantly associated with CHD mortality. Both transferrin saturation and serum iron were inversely related to CHD incidence [RR (95% CI): 0.76 (0.66, 0.88) and 0.68 (0.56, 0.82), respectively], but only transferrin saturation was inversely associated with CHD mortality (RR: 0.85; 95% CI: 0.73, 0.99). In conclusion, total iron intake and serum iron concentrations were inversely associated with CHD incidence, but heme iron intake was positively related to CHD incidence. Elevated serum transferrin saturation concentration was inversely associated with both CHD incidence and mortality. Future research is needed to establish the causal relation and to elucidate potential mechanisms.

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  • Authors+Show Affiliations

    ,

    Department of Epidemiology and Biostatistics, School of Public Health-Bloomington, Indiana University, Bloomington, IN.

    ,

    Source

    The Journal of nutrition 144:3 2014 Mar pg 359-66

    MeSH

    Coronary Disease
    Databases, Factual
    Diet
    Heme
    Humans
    Incidence
    Iron, Dietary
    Risk Factors
    Transferrin

    Pub Type(s)

    Journal Article
    Meta-Analysis
    Research Support, N.I.H., Extramural

    Language

    eng

    PubMed ID

    24401818

    Citation

    Hunnicutt, Jacob, et al. "Dietary Iron Intake and Body Iron Stores Are Associated With Risk of Coronary Heart Disease in a Meta-analysis of Prospective Cohort Studies." The Journal of Nutrition, vol. 144, no. 3, 2014, pp. 359-66.
    Hunnicutt J, He K, Xun P. Dietary iron intake and body iron stores are associated with risk of coronary heart disease in a meta-analysis of prospective cohort studies. J Nutr. 2014;144(3):359-66.
    Hunnicutt, J., He, K., & Xun, P. (2014). Dietary iron intake and body iron stores are associated with risk of coronary heart disease in a meta-analysis of prospective cohort studies. The Journal of Nutrition, 144(3), pp. 359-66. doi:10.3945/jn.113.185124.
    Hunnicutt J, He K, Xun P. Dietary Iron Intake and Body Iron Stores Are Associated With Risk of Coronary Heart Disease in a Meta-analysis of Prospective Cohort Studies. J Nutr. 2014;144(3):359-66. PubMed PMID: 24401818.
    * Article titles in AMA citation format should be in sentence-case
    TY - JOUR T1 - Dietary iron intake and body iron stores are associated with risk of coronary heart disease in a meta-analysis of prospective cohort studies. AU - Hunnicutt,Jacob, AU - He,Ka, AU - Xun,Pengcheng, Y1 - 2014/01/08/ PY - 2014/1/10/entrez PY - 2014/1/10/pubmed PY - 2014/4/15/medline SP - 359 EP - 66 JF - The Journal of nutrition JO - J. Nutr. VL - 144 IS - 3 N2 - The link between iron intake as well as body iron stores and coronary heart disease (CHD) has been contentiously debated, and the epidemiologic evidence is inconsistent. We aimed to quantitatively summarize the literature on the association between dietary iron intake/body iron stores and CHD risk by conducting a meta-analysis of prospective cohort studies. PubMed was used to find studies published through June 2013 in peer-reviewed journals. Embase or a hand search of relevant articles was used to obtain additional articles. The pooled RRs of CHD incidence and mortality with 95% CIs were calculated by using either a random-effects or fixed-effects model, as appropriate. Twenty-one eligible studies (32 cohorts) including 292,454 participants with an average of 10.2 y of follow-up were included. Heme iron was found to be positively associated with CHD incidence (RR: 1.57; 95% CI: 1.28, 1.94), whereas total iron was inversely associated (RR: 0.85; 95% CI: 0.73, 0.999). Neither heme-iron nor total iron intakes were significantly associated with CHD mortality. Both transferrin saturation and serum iron were inversely related to CHD incidence [RR (95% CI): 0.76 (0.66, 0.88) and 0.68 (0.56, 0.82), respectively], but only transferrin saturation was inversely associated with CHD mortality (RR: 0.85; 95% CI: 0.73, 0.99). In conclusion, total iron intake and serum iron concentrations were inversely associated with CHD incidence, but heme iron intake was positively related to CHD incidence. Elevated serum transferrin saturation concentration was inversely associated with both CHD incidence and mortality. Future research is needed to establish the causal relation and to elucidate potential mechanisms. SN - 1541-6100 UR - https://www.unboundmedicine.com/medline/citation/24401818/Dietary_iron_intake_and_body_iron_stores_are_associated_with_risk_of_coronary_heart_disease_in_a_meta_analysis_of_prospective_cohort_studies_ L2 - https://academic.oup.com/jn/article-lookup/doi/10.3945/jn.113.185124 DB - PRIME DP - Unbound Medicine ER -