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Sunday, March 23, 2014

Eat More, Die Young - Revolutionary Findings

Eat more, die young: 
Why eating a diet very low in nutrients can extend lifespan

Source:
Wiley
Summary:
A new evolutionary theory claims that consuming a diet very low in nutrients can extend lifespan in laboratory animals, a finding which could hold clues to promoting healthier aging in humans. Scientists have known for decades that severely restricted food intake reduces the incidence of diseases of old age, such as cancer, and increases lifespan. The most widely accepted theory is that this effect evolved to improve survival during times of famine.
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A new evolutionary theory in BioEssays 
claims that consuming a diet very low in nutrients can extend lifespan in laboratory animals, a finding which could hold clues to promoting healthier ageing in humans.

Scientists have known for decades
that severely restricted food intake reduces the incidence of diseases of old age, such as cancer, and increases lifespan.
"This effect has been demonstrated in laboratories
around the world, in species ranging from yeast to flies to mice. There is also some evidence that it occurs in primates," says lead author, Dr Margo Adler, an evolutionary biologist at UNSW Australia.
The most widely accepted theory
is that this effect evolved to improve survival during times of famine. "But we think that lifespan extension from dietary restriction is more likely to be a laboratory artefact," says Dr Adler.
Lifespan extension is unlikely to occur in the wild,
because dietary restriction compromises the immune system's ability to fight off disease and reduces the muscle strength necessary to flee a predator.
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"Unlike in the benign conditions of the lab, most animals in the wild are killed young by parasites or predators," says Dr Adler.
"Since dietary restriction appears to extend lifespan
in the lab by reducing old-age diseases, it is unlikely to have the same effect on wild animals, which generally don't live long enough to be affected by cancer and other late-life pathologies."
Dietary restriction, however, also leads to increased rates of cellular recycling and repair mechanisms in the body.
The UNSW researchers' new theory
is that this effect evolved to help animals continue to reproduce when food is scarce; they require less food to survive because stored nutrients in the cells can be recycled and reused.
It is this effect that could account for the increased lifespan of laboratory animals on very low-nutrient diets, because increased cellular recycling reduces deterioration and the risk of cancer.
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"This is the most intriguing aspect,
from a human health stand point. Although extended lifespan may simply be a side effect of dietary restriction, a better understanding of these cellular recycling mechanisms that drive the effect may hold the promise of longer, healthier lives for humans," she says.
It may be possible in future, for example, to develop drugs that mimic this effect.

Original story found here: http://www.sciencedaily.com/releases/2014/03/140317084742.htm
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http://www.sciencedaily.com/releases/2014/03/140317084742.htm

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