Vitamin D in preventive medicine

Area of Science:

• Public Health
• Nutritional Science
• Gerontology

Background:

• Vitamin D deficiency presents a significant global public health challenge.
• Meta-analyses of randomized controlled trials (RCTs) suggest vitamin D supplementation benefits bone health and reduces mortality.
• Controversy persists regarding the full spectrum of vitamin D's health effects beyond skeletal benefits.

Purpose of the Study:

• To address the public health concern of vitamin D deficiency.
• To evaluate the evidence for vitamin D supplementation's benefits, including skeletal and extra-skeletal effects.
• To examine the gap between recommended vitamin D intake and prevalent deficiency levels.

Main Methods:

• Systematic review and meta-analysis of randomized controlled trials (RCTs).
• Analysis of Dietary Reference Intakes (DRI) and Recommended Dietary Allowances (RDA) for vitamin D.
• Assessment of vitamin D deficiency prevalence in general populations, with a focus on the elderly.

Main Results:

• RCT meta-analyses indicate vitamin D supplementation reduces fractures, falls, and mortality.
• Current Recommended Dietary Allowances (RDA) are 600–800 IU/day, aiming for 20 ng/mL (50 nmol/L) 25-hydroxyvitamin D.
• A significant gap exists between RDA and actual intake, leading to high deficiency rates, especially in the elderly.

Conclusions:

• Vitamin D supplementation shows promise for reducing fractures, falls, and mortality.
• Achieving adequate vitamin D levels (RDA) necessitates proactive public health strategies.
• Strategies include food fortification, targeted supplementation, and public health awareness campaigns to combat widespread deficiency.