The latest trends in medicine encourage health care providers to prescribe nutrient-dense foods and exercise to prevent or delay the shortening of telomeres. On which biological theory of aging are these practices based?
a. Genetic research c. Pacemaker theory
b. Caloric restriction d. Cross-link theory
A
Genetic researchers have found that telomeres shorten with each cellular reproduction and con-tinue to do so until the cell dies. Selected animal studies since the 1930s conclude that calorie restrictions of 30% can lead to a longer life expectancy, slower metabolism, lower body temper-ature, and delay of age-related disorders. The pacemaker theory, which is also known as the neuroendocrine control theory, holds that critical functions of selected endocrine glands slow and can halt with age. The cross-link theory suggests that aging is a result of the stiffening of proteins caused by cross-linking, leading to stiffer joints, rougher skin, and decreased cellular elasticity.
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