Low vitamin D status: definition, prevalence, consequences, and correction

Area of Science:

• Nutritional Science
• Endocrinology
• Public Health

Background:

• Low vitamin D status is a prevalent global health issue, stemming from inadequate dietary intake and reduced skin synthesis.
• Suboptimal vitamin D levels are linked to significant health problems, including osteomalacia, rickets, osteoporosis, falls, and fractures.
• Emerging evidence suggests a potential link between low vitamin D status and an increased risk for various other health conditions.

Purpose of the Study:

• To review the current understanding of vitamin D status and its health implications.
• To discuss the optimal target concentrations of 25-hydroxyvitamin D (25(OH)D) for health.
• To evaluate appropriate strategies for vitamin D supplementation and measurement.

Main Methods:

• Literature review and synthesis of existing research on vitamin D status, health outcomes, and supplementation.
• Analysis of recommended vitamin D intake levels for achieving optimal 25(OH)D concentrations.
• Discussion of guidelines for 25(OH)D testing and population-level interventions.

Main Results:

• Optimal health is likely associated with circulating 25(OH)D concentrations exceeding 30-32 ng/mL.
• Daily vitamin D3 intake of at least 1000 IU is suggested, with potentially higher population-wide intakes needed.
• Widespread screening for 25(OH)D is considered premature; targeted screening in at-risk individuals is recommended.

Conclusions:

• Optimizing vitamin D status across populations has the potential to prevent numerous diseases.
• Improved vitamin D levels may lead to reductions in morbidity, mortality, and healthcare costs.
• Targeted vitamin D supplementation and monitoring in specific populations are currently the most appropriate strategies.