None of our  parents and their contemporaries suffered from dementia! Most were illiterate. Their diet consist of home grown vegetables, livestock less pesticides. Physically working the land for their livelihoods and entertainment was talking stories at the end of a hard day's work! Simply living  by helping those in need. Healthy mind, spiritual and physically! Maybe it's all these modern technologies that did most of our thinking and preservatives in our foods are the culprits .