The recent cholesterol study was large and long -- 9,844 Californians were followed for three decades -- and the data are striking. People with high cholesterol -- 240 or higher -- were 57% more likely to develop Alzheimer's disease. Those with borderline range cholesterol -- 200 to 239 -- were 23% more likely.
The diet and exercise study reported last week was smaller and shorter. In it, 1,880 elderly New Yorkers were followed for an average of 5 1/2 years. It found exercise alone was linked to as much as a 50% reduced risk, diet alone by as much as 40%.
Debra Cherry, executive vice president of the Alzheimer's Assn. California Southland Chapter, says that when she served on the Healthy Brain Initiative, a government workshop seeking evidence-based recommendations for reducing risk, the strongest case made was for aerobic activity.
"I don't know if anyone will ever be able to do a randomized, controlled study, but the evidence is pretty strong that aerobic exercise protects again heart disease and brain disease," she says. "And there's very little risk to doing it."
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