Osteoporosis International

, Volume 25, Issue 8, pp 2047–2056

Calcium supplement intake and risk of cardiovascular disease in women

Authors

    • Channing Division of Network Medicine, Department of MedicineBrigham and Women’s Hospital
    • Harvard Medical School
    • Renal Division, Department of MedicineBrigham and Women’s Hospital
  • G. C. Curhan
    • Channing Division of Network Medicine, Department of MedicineBrigham and Women’s Hospital
    • Harvard Medical School
    • Renal Division, Department of MedicineBrigham and Women’s Hospital
    • Department of EpidemiologyHarvard School of Public Health
  • Q. Sun
    • Channing Division of Network Medicine, Department of MedicineBrigham and Women’s Hospital
    • Harvard Medical School
    • Department of NutritionHarvard School of Public Health
  • K. M. Rexrode
    • Channing Division of Network Medicine, Department of MedicineBrigham and Women’s Hospital
    • Harvard Medical School
    • Division of Preventive Medicine, Department of MedicineBrigham and Women’s Hospital
  • J. E. Manson
    • Channing Division of Network Medicine, Department of MedicineBrigham and Women’s Hospital
    • Harvard Medical School
    • Department of EpidemiologyHarvard School of Public Health
    • Division of Preventive Medicine, Department of MedicineBrigham and Women’s Hospital
  • E. B. Rimm
    • Channing Division of Network Medicine, Department of MedicineBrigham and Women’s Hospital
    • Harvard Medical School
    • Department of EpidemiologyHarvard School of Public Health
    • Department of NutritionHarvard School of Public Health
  • E. N. Taylor
    • Channing Division of Network Medicine, Department of MedicineBrigham and Women’s Hospital
    • Harvard Medical School
    • Division of Nephrology and TransplantationMaine Medical Center
Original Article

DOI: 10.1007/s00198-014-2732-3

Cite this article as:
Paik, J.M., Curhan, G.C., Sun, Q. et al. Osteoporos Int (2014) 25: 2047. doi:10.1007/s00198-014-2732-3

Abstract

Summary

Some recent reports suggest that calcium supplement use may increase risk of cardiovascular disease. In a prospective cohort study of 74,245 women in the Nurses' Health Study with 24 years of follow-up, we found no independent associations between supplemental calcium intake and risk of incident coronary heart disease (CHD) and stroke.

Introduction

Some recent reports suggest that calcium supplements may increase cardiovascular disease (CVD) risk. The objective was to examine the independent associations between calcium supplement use and risk of CVD.

Methods

We conducted a prospective cohort study of supplemental calcium use and incident CVD in 74,245 women in the Nurses' Health Study (1984–2008) free of CVD and cancer at baseline. Calcium supplement intake was assessed every 4 years. Outcomes were incident CHD (nonfatal or fatal MI) and stroke (ischemic or hemorrhagic), confirmed by medical record review.

Results

During 24 years of follow-up, 4,565 cardiovascular events occurred (2,709 CHD and 1,856 strokes). At baseline, women who took calcium supplements had higher levels of physical activity, smoked less, and had lower trans fat intake compared with those who did not take calcium supplements. After multivariable adjustment for age, body mass index, dietary calcium, vitamin D intake, and other CVD risk factors, the relative risk of CVD for women taking >1,000 mg/day of calcium supplements compared with none was 0.82 (95 % confidence interval [CI] 0.74 to 0.92; p for trend <0.001). For women taking >1,000 mg/day of calcium supplements compared with none, the multivariable-adjusted relative risk for CHD was 0.71 (0.61 to 0.83; p for trend < 0.001) and for stroke was 1.03 (0.87 to 1.21; p for trend = 0.61). The relative risks were similar in analyses limited to non-smokers, women without hypertension, and women who had regular physical exams.

Conclusions

Our findings do not support the hypothesis that calcium supplement intake increases CVD risk in women.

Keywords

Calcium supplementsCardiovascular diseaseCoronary heart diseaseProspective studyStroke

Supplementary material

198_2014_2732_MOESM1_ESM.docx (22 kb)
ESM 1(DOCX 22.4 kb)

Copyright information

© International Osteoporosis Foundation and National Osteoporosis Foundation 2014