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Vitamin D and cardiovascular disease: is there evidence to support the bandwagon?

Giovanni Annuzzi1, Giuseppe Della Pepa, Claudia Vetrani

  • 1Department of Clinical and Experimental Medicine, Federico II University, Via Pansini 5, 85046 Naples, Italy. annuzzi@unina.it

Current Atherosclerosis Reports
|September 11, 2012
PubMed

Insights

Vitamin D deficiency is linked to cardiovascular disease (CVD) and type 2 diabetes, but evidence for a causal link is limited. Low vitamin D may signal an unhealthy lifestyle needing intervention.

Area of Science:

  • Endocrinology
  • Cardiology
  • Public Health

Background:

  • Growing evidence suggests a link between vitamin D deficiency and cardiovascular disease (CVD), including increased cardiovascular mortality and type 2 diabetes incidence.
  • Lifestyle factors, such as physical activity, may confound the observed association between vitamin D levels and CVD.
  • Current randomized controlled trials (RCTs) not specifically designed for cardiovascular outcomes do not support a causal relationship.

Purpose of the Study:

  • To review the accumulated evidence on the association between vitamin D deficiency and cardiovascular disease.
  • To discuss the potential role of lifestyle factors in the observed associations.
  • To highlight the need for specifically designed RCTs to clarify the causal relationship and the effects of vitamin D supplementation on cardiovascular health.

Main Methods:

  • Systematic review of recent scientific literature and observational studies.
  • Analysis of data from completed and ongoing randomized controlled trials (RCTs).
  • Evaluation of the impact of lifestyle factors on vitamin D levels and cardiovascular risk.

Main Results:

  • Observational studies show a consistent association between vitamin D deficiency and increased risk of CVD, cardiovascular mortality, and type 2 diabetes.
  • The association with cardiovascular mortality appears stronger than with nonfatal CVD events.
  • Existing RCTs, not powered for cardiovascular outcomes, have not substantiated these observational findings.

Conclusions:

  • Low vitamin D levels are currently best understood as a marker of an unhealthy lifestyle rather than a direct cause of CVD.
  • Further research through specifically designed RCTs is crucial to determine the efficacy of vitamin D supplementation for cardiovascular prevention.
  • Emphasis should be placed on promoting healthy lifestyles to address both vitamin D status and cardiovascular risk.

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