Dementia is a loss of brain function that occurs with certain diseases. There are two main causes of non-reversible dementia: Alzheimer’s and vascular. Alzheimer’s is from plaques that form between nerve cells in the brain, and tangles that are proteins twisted up that form inside dying cells. It is believed that these plaques and tangles interfere with nerve pathways resulting in dementia. Vascular dementia occurs when blood flow to the brain is interrupted, usually by a st