Cleveland Clinic 2001 studies: watching too much television (e.g., average four hours a day) was linked to a higher risk of developing Alzheimer’s disease. Adults with pastimes that challenge / stimulate the brain (e.g., playing bridge or chess, knitting, reading), were 2.5 times less likely than others to develop Alzheimer’s. (Greenwood-Robinson, Maggie, PhD. 20/20 Thinking. NY:Avery, 2003, pp 218-219)
Did you know that Alzheimer's may not be inevitable even if you have a genetic predisposition? According to Gary Small MD, director of the UCLA Longevity Center, reducing risk factors such as smoking, diabetes, obesity, and inactivity by 25% could prevent half-a-million cases annually in the USA. The goal is to stave off the disease long enough so you can live life without ever suffering Alzheimer's symptoms. (Small, Gary MD. The Alzheimer's Prevention Program: Keep Your Brain Healthy for the Rest of Your Life.)
Refer to Brain Dysfunctions for additional information.