Unraveling the Relationship Between Vitamin D and Noncommunicable Diseases: A Systemic Review and Meta-Analysis

Subclinical vitamin D insufficiency is frequent in both developing and developed countries. Even after rickets was eliminated in the 1930s by fortifying milk, up to 1 billion people worldwide suffer from subclinical vitamin D deficiency (VDD). Numerous noncommunicable diseases (NCDs), including depression, autoimmune illnesses, diabetes, osteoporosis, and cardiovascular disease, are linked to this deficiency.

The Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) protocol was applied when conducting a systematic review. Relevant studies published between 2010 and 2023 were found by searching databases such as Web of Science, Scopus, and PubMed. To find correlations between deficiency of vitamin D and NCDs, data was extracted from the studies and analyzed using the Mixed Method Appraisal Tools (MMAT). In meta-analysis data combined from multiple observational Unraveling the Relationship Between Vitamin D and Noncommunicable Diseases-A Systemic Review and Meta-Analysis studies to evaluate the relationship between vitamin D insufficiency and health outcomes. Statistical techniques, such as calculating effect sizes and constructing confidence ranges, are employed to determine combined outcomes and investigate possible causal connections.

Fourteen studies-including cross-sectional studies, prospective cohorts, randomized controlled trials, and longitudinal studies-met the inclusion criteria. Significant correlations among deficiency of vitamin D and a number of NCDs, including anemia, diabetes, hypertension, rheumatoid arthritis (RA), mental health issues, and autoimmune hypothyroidism, were found in the review. The results highlight the prevalence of deficiency of vitamin D worldwide and its detrimental impact on health. In order to lower the risk of numerous NCDs, this review emphasizes the need for greater awareness and possible interventions to maintain appropriate vitamin D levels. A meta-analysis was conducted to investigate the potential causal connections between vitamin D insufficiency and different health disorders. It elucidates the connections between deficient levels of vitamin D and conditions such as mental health disorders, anemia, diabetes, hypertension, and autoimmune diseases. The study prioritizes the examination of temporal correlations, biological plausibility, and the removal of confounding factors to provide support for these associations. While the text acknowledges that experimental data, such as randomized controlled trials, would enhance the argument for causation, it mostly depends on observational studies.