Vitamin D deficiency linked with RTIs
February 25, 2026
NEW research led by the University of Surrey has indicated that severe vitamin D deficiency is associated with a higher rate of hospitalisation for respiratory tract infections (RTIs).
Lower RTIs (pneumonia and bronchitis) rank among the top 20 leading causes of mortality globally for individuals aged 50-74 years and in the top 10 for those aged 75 years and older.
In the largest study of its kind, researchers analysed NHS data from more than 36,000 participants in the UK Biobank to investigate the link between vitamin D status and the rate of hospitalisation due to RTIs.
They found that those with a severe deficiency (below 15 nnmol/L) were 33% more likely to be admitted to hospital for treatment than those with sufficient levels of vitamin D (at least 75 nmol/L).
“Vitamin D is vital to our physical wellbeing,” explained lead author Abi Bournot.
“Not only does it keep our bones and muscles healthy, its antibacterial and antiviral properties are also thought to help reduce the risk of RTIs that can lead to hospitalisation.
“This research attaches hard data to support the theory.
“Despite its importance to our overall health, many people are deficient and do not meet the [recommended intake],” she concluded.
The authors said the findings warrant further study, and point to the potential for vitamin D supplementation to reduce the risk of RTI-related hospitalisations in the future.
The paper is available HERE. KB
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