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AGING
Average lifespan in a population is lowered by infant and child mortality, which are frequently linked to infectious diseases or nutrition problems. Later in life, vulnerability to accidents and age-related afflictions such as cancer or cardiovascular disease play larger roles. Extension of average lifespan can be achieved by good diet, exercise and avoidance of hazards such as smoking. Maximum lifespan is determined by the rate of aging for a species inherent in its genes and probably by certain environmental factors. One widely recognized method of extending maximum lifespan in organisms such as nematodes is calorie restriction. Another technique used evolutionary pressure such as breeding from only older members. Theoretically, extension of maximum lifespan could be achieved by reducing the rate of aging damage, by periodic replacement of damaged tissues, or by molecular repair or rejuvenation of deteriorated cells and tissues.
Diets and supplements
Much of life extension has been concerned with the use of nutrition, in the form of diets or supplements, to extend lifespan. The many diets promoted by anti-aging advocates are often contradictory. One of the few areas of consensus among nutritionists is the importance of keeping stable blood sugar levels, achieved in part by managing the glycemic indices of food choices. Two diets with different approaches and some support from scientific research are the Paleolithic diet and Caloric restriction.
The restriction of energy intake, or calories, in an otherwise healthy diet (a practice generally called Calorie restriction or simply CR) has been shown to extend the maximum life span of laboratory organisms from several species, including rats, yeast, fruit flies, and nematodes. In rodents, a roughly 50% maximum lifespan extension is seen with a roughly 50% restriction of calories from what would be consumed by freely-feeding animals.
The results of calorie restriction experiments on laboratory rats may not be generalizable because years of inbreeding have made these animals different from those found in the wild, and because these results are applicable specifically to short-lived species that have evolved to respond to feast and famine with alterations in longevity.
Proving that calorie restriction could extend human life is difficult because experiments with long-lived species necessarily take a long time to perform. Scientists propose that the results of calorie restriction experiments on animals also depend on the habitat, genetics, other aspects of nutrition and frequencies of feeding.
The idea that antioxidant supplements, such as Vitamin C, Vitamin E, lipoic acid and N-acetylcysteine, might extend human life stems from the free radical theory of aging. Other substances proposed to extend lifespan include oxytocin, insulin, human chorionic gonadotropin (hCG) and erythropoietin (EPO). Resveratrol is a sirtuin stimulant that appears to extend lifespan in simple model organisms such as nematodes and short-lived fish.
Some supplements, including the minerals selenium or zinc have been reported to extend the lifespan of rats and mice, though none has been proven to do so in humans, and significant toxic effects were observed. Metformin may also extend life span in mice.
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