The paper I’ll point out today reports on the effects of calorie restriction in mice and humans on markers of cellular senescence, one of the contributing cause of aging. Calorie restriction is well known to slow aging and extend life span in a near all species and lineages tested, with that effect being largest in short-lived species. Mice live up to 40% longer when calorie restricted, but in humans it would be surprising to find an effect larger than five years or so – once firm data is in hand, which is not presently the case. Nonetheless, the short term benefits to health and the changes to cellular metabolism produced by the practice of calorie restriction are quite similar across mammalian species of different life spans.
These are sweeping changes: near every measure of metabolic activity and progression of aging is altered by calorie restriction. Given that, it is challenging to identify the size of the contribution of any given mechanism, but it is certainly fair to ask. To what degree does calorie restriction act through a reduction of each of the forms of cell and tissue damage that cause aging? One of the forms
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