"... than triple in the next 35 years. That grim prospect is what makes a study published in March in The Journal of Alzheimer's Disease so encouraging: It turns out that regular walking, cycling, swimming, dancing and even gardening may substantially reduce the risk of Alzheimer's...."
http://mobile.nytimes.com/blogs/well/2016/04/07/sweat-smart/?emc=eta1&src=me&ref=general&referer=
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