A recent study revealed that vitamin D deficiency (VDD) is linked to a heightened long-term risk of epilepsy and seizures in adults with type 2 diabetes mellitus (T2DM). This retrospective cohort study utilized data from the TriNetX Global Collaborative Network, analyzing 135,329 adults diagnosed with T2DM and categorized based on vitamin D levels recorded between 2013 and 2023. Participants were classified as having VDD if their serum 25-hydroxyvitamin D was below 20 ng/mL, while those with levels above 30 ng/mL were considered to have normal vitamin D status.
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The findings highlighted that individuals with VDD experienced a significantly higher incidence of epilepsy or seizures compared to those with normal vitamin D levels (1.10% vs. 0.78%; hazard ratio [HR], 1.37; 95% confidence interval [CI], 1.26–1.48; p < 0.001). Increased risks were also observed across various epilepsy subtypes, including focal epilepsy (HR, 1.40; p < 0.001), generalized epilepsy (HR, 1.42; p = 0.003), and intractable epilepsy (HR, 1.92; p < 0.001). Furthermore, patients with VDD showed greater use of antiepileptic medications (HR, 1.25; p < 0.001) and higher all-cause mortality rates (9.43% vs. 6.18%; HR, 1.47; p < 0.001).
The study's methodology involved stringent exclusion criteria to eliminate patients with pre-existing epilepsy or recurrent seizures. Propensity score matching was employed to balance potential confounding factors, ensuring comparability between the cohorts. The research findings underline the connection between VDD and increased seizure risk but do not establish causation or indicate that vitamin D supplementation can prevent seizures.
Identifying and addressing VDD in patients with T2DM may prompt earlier clinical intervention and monitoring, though further research is necessary to explore whether vitamin D correction directly impacts seizure outcomes. Overall, the study provides important insights into the relationship between vitamin D status and neurological complications in individuals with T2DM.