Prevention of Alzheimer’s Disease and Dementia is found with stopping neuron cell death.  Consider that all dementia has occurred from different aspects of brain damage – your primary goal will be to identify what is causing/could cause brain damage.  Understanding that the micron stroke is damage to the brain so small you will not know it happened as a single event, and an MRI will not show the single event – yet over time they add up to cause significant problems with memory and mind.