Vitamin D, Cardiovascular Disease and Risk Factors

Area of Science:

• Cardiovascular Health
• Endocrinology
• Nutritional Science

Background:

• Observational studies suggest vitamin D may protect the cardiovascular system.
• Current evidence does not confirm benefits or harms of vitamin D supplementation for cardiovascular health.
• Vitamin D's role in cardiovascular disease, risk factors, and emerging factors is under investigation.

Purpose of the Study:

• To review current knowledge on vitamin D's effects on cardiovascular health.
• To discuss vitamin D's association with cardiovascular diseases and risk factors.
• To evaluate the discrepancy between observational and interventional study findings.

Main Methods:

• Review of observational studies, meta-analyses, Mendelian randomization studies, and randomized controlled trials (RCTs).
• Focus on vitamin D's relationship with ischemic heart disease, stroke, hypertension, dyslipidemia, obesity, and other emerging risk factors.
• Analysis of ongoing RCTs to clarify causal relationships.

Main Results:

• Observational studies show an inverse association between vitamin D levels and cardiovascular risk.
• Mendelian randomization studies and RCTs have not consistently replicated these observational findings.
• Inconclusive evidence regarding the cardiovascular benefits or harms of vitamin D supplementation.

Conclusions:

• The protective role of vitamin D in cardiovascular health remains uncertain.
• Vitamin D deficiency's causal role in cardiovascular disease requires further investigation through ongoing RCTs.
• Clarification is needed on whether vitamin D deficiency is a reversible factor for cardiovascular disease prevention.