More On Exercise and Neurodegeneration

From the New Scientist, and just to drive the point home, another article on exercise and rates of neurodegenerative disease: "Regular exercise may reduce the risk of dementia and Alzheimer's disease in the elderly by as much as 40%, according to a new study. And the effect is even more pronounced for those who are more frail ... the biological mechanism behind the results is unknown, but that it may result from exercise causing a reduction in vascular disease. ... It could be that these people are still developing plaques [deposits in the brain which cause Alzheimer's] but exercise is stopping them from having strokes - so they are not showing clinical symptoms of dementia."