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Vitamin D May Cut Severe Flu Risk
24 Jan
Summary
- Severe vitamin D deficiency linked to 33% higher hospitalization rate.
- Each 10 nmol/L increase in vitamin D dropped hospitalization by 4%.
- 18% of Americans have inadequate vitamin D levels, study finds.
Research published in The American Journal of Clinical Nutrition indicates that vitamin D could play a role in reducing severe outcomes from respiratory infections. Analysis of UK Biobank data revealed that individuals with severe vitamin D deficiency (under 15 nmol/L) faced a 33% greater likelihood of hospitalization for respiratory tract infections compared to those with levels of 75 nmol/L or higher.
For every 10 nmol/L increase in vitamin D concentration, the hospitalization rate for such infections decreased by 4%. This finding is particularly relevant as an estimated 18% of Americans have inadequate vitamin D levels. Experts note that vitamin D supports both innate and adaptive immune functions.
While the study was observational, focusing on severe deficiencies, it highlights the importance of adequate vitamin D levels for immune health. However, doctors emphasize that vitamin D supplementation should be approached cautiously. Excessive intake can lead to harmful calcium buildup in the blood. Consulting a healthcare provider for a blood test to determine individual needs before starting any supplement regimen is recommended.
