An article from 2018 by the National Institute of Aging by the National Institutes of Health, discusses the basics of Alzheimer's disease and dementia cognitive health. The article Preventing Alzheimer's Disease: What Do We Know talks about some ways that could prevent or delay the disease, "A recent review of research looked carefully at the evidence on ways to prevent or delay Alzheimer's dementia or age-related cognitive decline. Led by a committee of experts from the National Academies of Sciences, Engineering, and Medicine (NASEM), the review found "encouraging but inconclusive" evidence for three types of interventions: Increased physical activity, Blood pressure control for people with high blood pressure (also called hypertension), cognitive training. The evidence for other interventions, such as medications and diet, was not as strong. However, scientists are continuing to explore these and other possible preventions."
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Reference
NIH National Institute of Aging (NIA), (2018). National Institutes of Health. https://www.nia.nih.gov/health/preventing-alzheimers-disease-what-do-we-know