Cardiovascular diseases and hard drinking waters: implications from a systematic review with meta-analysis of

Vincenza Gianfredi1, Nicola Luigi Bragazzi2, Daniele Nucci3

  • 1School of Specialization in Hygiene and Preventive Medicine, Department of Experimental Medicine, University of Perugia, Perugia, Italy; † These authors contributed equally to this work.

Insights

Drinking water rich in calcium and magnesium may protect against cardiovascular diseases (CVD). This systematic review suggests a potential benefit, but further research is needed to confirm these findings due to study limitations.

Area of Science:

  • Environmental Health
  • Cardiovascular Epidemiology
  • Mineral Metabolism

Background:

  • Cardiovascular diseases (CVD) represent a significant public health burden, particularly in high-income nations.
  • The role of minerals in drinking water, such as calcium and magnesium, in CVD risk is an area of ongoing investigation.
  • Understanding environmental factors influencing CVD is crucial for developing effective prevention strategies.

Purpose of the Study:

  • To systematically review and meta-analyze the association between magnesium and calcium concentrations in drinking water and the risk of cardiovascular diseases.
  • To evaluate the potential protective effects of mineral-rich water against CVD.
  • To identify gaps in current research and guide future studies.

Main Methods:

  • A systematic review and meta-analysis were conducted adhering to Preferred Reporting Items for Systematic Reviews and Meta-analysis (PRISMA) guidelines.
  • Case-control studies were included, with seven studies quantitatively analyzed from an initial pool of 643 articles.
  • Comparisons were made between subjects exposed to the highest versus lowest ion concentrations, involving over 44,000 participants.

Main Results:

  • The meta-analysis indicated a protective effect of calcium (Effect Size [ES] = 0.82, 95% CI [0.70-0.95]) and magnesium (ES = 0.75, 95% CI [0.66-0.86]) in drinking water against CVD.
  • Hard water consumption appeared to be associated with a reduced risk of CVD.
  • Significant heterogeneity (I² > 70%) and publication bias were observed for both minerals, questioning the robustness of the findings.

Conclusions:

  • The findings suggest that drinking water containing higher concentrations of calcium and magnesium may offer a protective effect against cardiovascular diseases.
  • However, the considerable heterogeneity and potential publication bias limit the generalizability and certainty of these results.
  • High-quality, prospective studies are essential to validate these preliminary findings and confirm the protective role of waterborne minerals in CVD prevention.

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