By Joshua Mitteldorf
Because the Nineteen Nineties, laboratory characterization of getting older has been diverging from predictions of evolutionary concept, specifically within the sector of genetics. simultaneously, a technological know-how of multilevel choice has discovered its position within the evolutionary literature. the writer means that proof warrants attention of a brand new paradigm for evolution of getting older, and proposes the demographic idea of senescence, wherein getting older has been affirmatively chosen since it degrees the dying price over the years, supporting to stabilize inhabitants dynamics and forestall extinctions. Read more...
summary: because the Nineteen Nineties, laboratory characterization of getting older has been diverging from predictions of evolutionary idea, particularly within the region of genetics. at the same time, a technology of multilevel choice has discovered its position within the evolutionary literature. the writer means that facts warrants attention of a brand new paradigm for evolution of getting older, and proposes the demographic concept of senescence, wherein getting older has been affirmatively chosen since it degrees the loss of life fee through the years, supporting to stabilize inhabitants dynamics and stop extinctions
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Additional resources for Aging is a group-selected adaptation: theory, evidence, and medical implications
There is no escaping the conclusion that animals un-stressed by caloric deprivation are leaving a major portion of their fitness on the table by not extending their lives, at a time when there is plenty of energy available both for repair and reproduction and plenty of room in the environment to expand the population. The only way to understand the fact that life is shortened just when resources are most abundant is to invoke dangers to the population if numbers are expanded too rapidly under these conditions.
Hellerstein, Alternate-day fasting and chronic disease prevention: a review of human and animal trials. Am. J. Clin. , 2007. 86(1): p. 7-13. 36. P. and D. Albanes, The effect of vitamin E and beta carotene on the incidence of lung cancer and other cancers in male smokers. The Alpha-Tocopherol, Beta Carotene Cancer Prevention Study Group. N. Engl. J. , 1994. 330(15): p. 1029-35. 37. , M. Down, and R. Sen, The effects of vitamin E and training on physiological function and athletic performance in adolescent swimmers.
In fact, the genes that signal life extension have very generally been found to be the same genes that fortify stress resistance. The mechanisms are one and the same. Animals respond to caloric restriction with better resistance to disease , enhanced agility and speed , and quicker, more reliable neuronal responses . Conversely, this means that when there is plenty of food, nature has arranged for animals to age more rapidly and also to be more vulnerable to death from every kind of stress.