The results of a study published in the journal *Frontiers in Nutrition* are based on an analysis of data from more than 325,000 people from the international TriNetX database. The authors found that individuals who had magnesium levels below 1.7 mg/dL recorded twice within a year had a 33% higher risk of developing dementia. The most pronounced association was observed with vascular dementia — the likelihood of developing it increased by 63%. Additionally, magnesium deficiency was linked to an increased risk of stroke and higher mortality from all causes. Scientists note that magnesium plays an important role in the functioning of the cardiovascular and nervous systems, as well as in metabolic processes. Its deficiency worsens blood supply to the brain and disrupts signal transmission between nerve cells, which may contribute to the development of cognitive impairments. At the same time, researchers emphasize that excess magnesium can also be unsafe. Specialists do not recommend self-administering magnesium supplements without consulting a doctor, as this may cause side effects and harm health.