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Vitamin D: How Low Levels Are Linked to Respiratory Infections

Published January 25, 2026, 06:05
Vitamin D: How Low Levels Are Linked to Respiratory Infections

New scientific data suggests a strong link between severe vitamin D deficiency and an increased risk of hospitalization due to respiratory infections, such as bronchitis and pneumonia. The study, conducted by the University of Surrey and published in The American Journal of Clinical Nutrition, analyzed data from over 36,000 individuals. The results showed that participants with vitamin D levels below 15 nmol/L had a 33% higher likelihood of being hospitalized for a respiratory infection compared to those with sufficient levels (at least 75 nmol/L). Furthermore, each 10 nmol/L increase in vitamin D was associated with a 4% reduction in the risk of hospitalization. Lower respiratory tract infections are a significant cause of death worldwide, especially in individuals over the age of 50. The study highlights the importance of prevention and adequate vitamin D intake, either through diet or supplements, as a means of reducing the risk of severe respiratory infections. The research provides strong evidence for the need to consider vitamin D levels in the population and to promote policies that encourage adequate intake of the vitamin, particularly in high-risk groups.