da Rosa MI, et al. - In this study involving 165 elderly individuals, researchers evaluated the correlation of vitamin D and vitamin B₁₂ with cognitive impairment. Data were obtained from a cross-sectional study involving individuals aged ≥ 80 years living in urban and rural areas of the cities of Siderópolis and Treviso, Santa Catarina, Brazil. They noted that the prevalence of cognitive decline was 35.2%. Furthermore, investigators found that elderly individuals with vitamin D levels of ≤ 18 ng mL⁻¹ had a higher prevalence of cognitive decline even after adjustment for potential confounders. Vitamin B₁₂ levels of ≥ 496 pg mL⁻¹ were also a risk factor for cognitive decline in this population.