Vitamin D requirement and setting recommendation levels - current Nordic view

Area of Science:

• Nutrition Science
• Public Health

Background:

• Nordic countries experience minimal vitamin D synthesis during winter.
• Dietary vitamin D intake averages 4-5 microg/day, with adolescents having the lowest intake.
• Low serum 25(OH)D levels are prevalent across Nordic populations.

Purpose of the Study:

• To address widespread vitamin D deficiency in Nordic populations.
• To mitigate the significant seasonal decline in serum 25(OH)D levels.
• To evaluate the impact of updated Nordic Nutrition Recommendations on vitamin D status.

Main Methods:

• Analysis of dietary vitamin D intake across different age groups.
• Monitoring of serum 25(OH)D levels in Nordic populations.
• Review of updated Nordic Nutrition Recommendations (2004).

Main Results:

• Serum 25(OH)D levels drop below 50 nmol/L in half the population during winter.
• The 2004 Nordic Nutrition Recommendations increased vitamin D intake guidance to 7.5 microg/day for ages 2-60.
• Current dietary intake is insufficient to meet the new recommendations for many.

Conclusions:

• Increased dietary vitamin D intake is crucial for Nordic populations, especially during winter.
• Public health initiatives like food fortification and education are needed to achieve recommended vitamin D levels.
• Achieving adequate vitamin D status requires a combination of updated recommendations and population-level interventions.