...Low-cal longevity questionedLimiting food intake in monkeys fails to extend survivalBy Nathan SeppaWeb edition : Wednesday, August 29th, 2012 Text SizeENLARGEIn a new study, rhesus monkeys on a calorie-restricted diet (such as the 27-year-old male at left) did not live longer than those consuming a more normal diet (like the male of the same age at right).National Institute on Aging/NIHDecades of research have linked low-calorie diets with extended survival, but a new report finds that rhesus monkeys on strict diets don’t live longer than their counterparts getting a standard diet.The findings, reported August 29 in Nature, run counter to a 2009 study from the University of Wisconsin–Madison that showed a clear survival advantage in a calorie-restricted group of similar rhesus monkeys. Scientists suspect that differences in the two studies’ designs might explain the discordant findings, leaving the question of longevity still dangling.Both research groups will need to wait another decade or more before all the monkeys live out their lives. But the authors of the new study, conducted at a National Institute on Aging laboratory in Baltimore, say their data are unlikely to change, since calculations show that the chance of a survival difference arising in the remaining monkeys is exceedingly low.“I don’t think one study overturns 75 years of research,” says Steven Austad, a bio-gerontologist at the University of Texas Health Science Center in San Antonio, who isn’t part of either...
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