Behind the mania is a widely used, inexpensive generic pill for Type 2 diabetes called metformin. Scientists are planning a clinical trial to see if the drug can delay or prevent some of the most devastating diseases of advanced age, from heart ailments to cognitive decline to cancer. To test the pill, gerontologists at 14 aging centers around the U.S. will follow 3,000 seniors for six years. Half the seniors involved would get the drug, while the others would receive a placebo.
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