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Two new studies suggest that substances usually associated with dulling the mind -- marijuana and red wine -- may help ward off Alzheimer's disease and other forms of age-related memory loss. Their addition comes as another study dethrones folk remedy ginkgo biloba as proof against the disease.

At a November meeting of the Society of Neuroscience in Washington, D.C., researchers from Ohio State University reported that THC, the main psychoactive substance in the cannabis plant, may reduce inflammation in the brain and even stimulate the formation of new brain cells.

Meanwhile, in the Nov. 21 issue of the Journal of Biological Chemistry, neurologist David Teplow of the University of California, Los Angeles reported that polyphenols -- naturally occurring components of red wine -- block the formation of proteins that build the toxic plaques thought to destroy brain cells. In addition, these substances can reduce the toxicity of existing plaques, thus reducing cognitive deterioration.

(h/t: Jinnet)