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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.
Abstract:
This systematic review with meta-analysis, performed according to the Preferred Reporting Items for Systematic Reviews and Meta-analysis (PRISMA) guidelines, aims at evaluating the potential correlation between magnesium and calcium concentration in drinking waters and the risk of cardiovascular diseases (CVD), which impose a considerable burden in high-income countries. Included studies were of the case-control studies type. From an initial list of 643 potentially eligible articles, seven studies were finally retained in the quantitative analysis. Since each one of them assessed different ion concentrations, subjects exposed to the highest concentration versus those exposed to the lowest concentration were compared. By including an overall figure of 44,000 subjects, the result suggests a protective effect of the ions on CVD prevention, with an effect-size (ES) of 0.82 (95% confidence interval CI = [0.70-0.95], p-value = 0.008) for calcium, and ES = 0.75 (95% CI = [0.66-0.86], p-value = 0.000) for magnesium. Hard water consumption seems to be protective against CVD. However, the high heterogeneity (I2 = 75.24, p-value = 0.001 for calcium; I2 = 72.96, p-value = 0.0024 for magnesium) and the existence of publication bias limits the robustness and generalizability of these findings. Further high-quality studies are needed to reproduce and confirm these results.
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