09/18/2009 05:12 am ET Updated Nov 17, 2011

Tests Begin on Drugs That May Slow Aging

It may be the ultimate free lunch -- how to reap all the advantages of a calorically restricted diet, including freedom from disease and an extended healthy life span, without eating one fewer calorie. Just take a drug that tricks the body into thinking it's on such a diet.

It sounds too good to be true, and maybe it is. Yet such drugs are now in clinical trials.

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