Cellular Aging Additional Theories Wearand Tear Theory

This theory postulates that ordinary insults and injuries of daily living accumulate and thus decrease the organism's efficiency (e.g., loss of teeth leads to starvation). Although there is little question that some wear and tear plays a role in mortality risk and individual life span, this theory has been rejected by most gerontologists as a more general explanation for aging because (i) animals raised in protected environments still age; (ii) many of the minor insults that accumulate are essentially time dependent and thus cannot logically serve as an underlying causal mechanism of the aging process; and (iii) the theory is outdated inasmuch as cellular and molecular advances point toward more specific mechanisms.

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