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Can Exercise Reduce Alzheimer's Risk?

(Well, New York Times) Exercise may help to keep the brain robust in people who have an increased risk of developing Alzheimer’s disease, according to an inspiring new study. The findings suggests that even moderate amounts of physical activity may help to slow the progression of one of the most dreaded diseases of aging…
Alzheimer’s disease, characterized by a gradual and then quickening loss of memory and cognitive functioning, can strike anyone. But scientists have discovered in recent years that people who harbor a specific variant of a gene, known as the APOE epsilon4 allele or the e4 gene for short, have a substantially increased risk of developing the disease…
[In this study], the members of the group carrying the e4 gene who did not exercise had undergone significant atrophy of their hippocampus. It had shrunk by about 3 percent, on average. Those volunteers who carried the e4 gene but who regularly exercised, however, showed almost no shrinkage of their hippocampus. Likewise, both groups of volunteers who did not carry the e4 gene showed little change to their hippocampus.
In effect, the brains of physically active volunteers at high risk for Alzheimer’s disease looked just like the brains of people at much lower risk for the disease, said Stephen M. Rao, … who oversaw the study. Exercise appeared to have been protective.
Community: There are many practical things we can do to prevent, delay, or minimize cognitive decline.
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Please do not give advice. We can best help each other by telling what works for us, not what we think someone else should do.