Some very interesting comments in this post. One of the things that makes a big difference to cognition is adequate hydration. I notice in many care facilities water is not readily available, and coffee and tea are the norm (both diuretics). Some elderly people stop drinking entirely because they are concerned about bladder control.
My mother was beginning to show some early signs of dementia - forgetfulness, repeating herself, losing things. I suggested an increase in water (and explained why), as well as providing reiki absently.
From that point on she began drinking a jug of water a day, cut her coffee intake down to two cups, and regained within a day or so her previous cognitive function. She died living independently and with all her marbles!
