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From NPR News, this is ALL THINGS CONSIDERED. I'm Melissa Block.
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And I'm Robert Siegel.
It sounds too good to be true. A mysterious substance found in red wine can let you enjoy a long and healthy life, even if you're overweight and eat a diet that is 60 percent fat. New research shows that the approach worked for some gluttonous lab mice.
But as NPR's Jon Hamilton reports, it'll take a lot more than a glass of cabernet sauvignon to get the same result in people.
JON HAMILTON: The mysterious substance here is called resveratrol. It's found in red grapes, among other things. Previous studies have found that resveratrol seems to extend the lives of worms, flies, and fish.
David Sinclair is part of a Harvard team that gave lots of resveratrol to some mice on a high fat diet. He says the mice put on a lot of weight, but they remained much healthier than fat mice who didn't get resveratrol.
Dr. DAVID SINCLAIR (Harvard University): The chance of dying was reduced about 30 percent. And the reason I can't tell you exactly how much longer they lived is the study's still going. We rushed it to publication because it was so dramatic.
HAMILTON: It was published online by the journal Nature. Sinclair says the fat mice getting resveratrol did as well as lean mice fed a standard diet.
Dr. SINCLAIR: They lived just as long, and they were just as healthy. And in physical tests, like balancing on a beam, they did just as well as young, lean mice, even though they were old and fat.
HAMILTON: Good news for mice, but what about people? Sinclair, who's involved with a company that hopes to market resveratrol, says he's optimistic.
Dr. SINCLAIR: This is proving what is potentially possible with drugs of the future. I'm saying that there might be a time when you could be prescribed a pill for, say, diabetes and as a side effect you might be protected against heart disease, cancer and maybe even Alzheimer's.
HAMILTON: That sort of talk has produced a lot of headlines, but not everyone is that upbeat. Matt Kaeberlein studies the biology of aging at the University of Washington.
Dr. MATT KAEBERLEIN (University of Washington): Most scientists are a bit more reserved in our optimism about resveratrol. This is certainly an interesting and exciting finding, but I think it's also somewhat preliminary.
HAMILTON: Kaeberlein says there are several reasons not to count on cabernets and pinots to save you from a lifetime of excess. One has to do with the tiny amount of resveratrol found in wine.
Dr. KAEBERLEIN: If you look at how much red wine, for example, you would have to consume, it's something like 300 glasses of red wine a day to get a comparable amount of resveratrol to what was given to the mice in this study.
HAMILTON: David Sinclair says it's actually more like 100 glasses. But you get the point. Of course, pills could provide much more resveratrol. Several dietary supplement companies already offer products advertised as containing resveratrol. But there's no easy way to know how much they contain. And Kaeberlein says there another problem with putting big doses of any untested substance in your body.
Dr. KAEBERLEIN: One concern that I have is what are the effects going to be over the long term? So if you're talking about taking a compound to affect diseases of aging, presumably you're talking about take that compound for many years, potentially decades. And over the timeframe of decades, a very small side effect can lead very severe complications.
HAMILTON: Studies show that in rats, massive doses of resveratrol can cause kidney and digestive problems. And Kaeberlein says it's still not clear precisely how resveratrol works, making it hard to predict what it will do in people.
He says consumers should remember that most scientific discoveries turn out to be disappointments. More than a decade ago, scientists and consumers were wildly excited about a hormone called leptin. It appeared to prevent obesity in mice. Humans are still waiting to benefit from that discovery.
Jon Hamilton, NPR News.
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