http://consumerist.com/2007/10/04/german-researchers-have-found/

German researchers have found that a glucose-restricted diet increases the number of free radicals in mice and worms, and extended their lifespans by up to 25%. The free radicals trigger the natural defense systems in the creatures, which in turn strengthen long-term cellular protection against the damaging molecules. So go ahead: smoke and curse all you want, and throw out that death-giving orange juice. [Reuters]