Vitamin D, known for its role in bone health, may also affect the digestive and respiratory systems. A new review of existing studies examined how vitamin D deficiency and variations in the vitamin D receptor (VDR) gene are linked to several conditions.
In the esophagus, VDR expression in submucosal glands might influence fibrosis in eosinophilic esophagitis. In the stomach, VDR is associated with malignancy and H. pylori infection. For intestinal diseases like inflammatory bowel disease, intestinal failure, and irritable bowel syndrome, vitamin D deficiency and VDR expression appear to be linked.
The review also looked at lung conditions such as COPD, asthma, and tuberculosis infection, finding connections to vitamin D status. However, studies on genetic polymorphisms in VDR and the effects of vitamin D supplementation on these diseases have been largely inconclusive.
Overall, while there are associations between vitamin D and various diseases, the evidence does not prove cause and effect. More research is needed to clarify whether vitamin D supplementation can help prevent or treat these conditions.