Vitamin B12 (cobalamin) is an essential nutrient of critical importance for general health. It plays a crucial role in the body's metabolic functions, DNA synthesis, and the sustainability of the hematopoietic system. It is also necessary for myelin sheath synthesis (myelination) in the central nervous system. Vitamin B12 deficiency is generally defined by a drop in serum or plasma B12 levels below 148 pmol/L (200 pg/mL).

For years, scientific studies have revealed a connection between age-related hearing loss and the risk of Alzheimer's. However, the underlying mechanisms of this link are still being investigated. Possibilities include people socializing less due to hearing loss, and the increased burden on auditory regions of the brain affecting processing in other brain areas, thereby weakening cognitive performance.

It is widely known that diabetes can affect organs such as the eyes, kidneys, and heart; however, its impact on the auditory system is...