Calorie restriction, also known as dietary restriction in the scientific community, is the practice of consuming up to 40% fewer calories than usual, while still obtaining optimal levels of micronutrients. It produces sweeping changes in the operation of cellular metabolism, slows near all measures of aging, and extends life in mice. Thus for any particular aspect of aging, and here the focus is on chronic inflammation in the brain that accelerates progression of age-related neurodegeneration, it is possible to invest a great deal of time and effort into investigating just how calorie restriction slows it down.
This sort of work is of great scientific interest, as it will help researchers to build a comprehensive map of cellular metabolism and the changes that take place over the course of aging. It is not, however, a road to rejuvenation. Calorie restriction, like all approaches involving upregulation of cellular stress responses, has a much smaller effect on life span in humans than in short-lived species such as mice. There isn’t a way to conjure a reversal of aging in the elderly from this biochemistry. That requires a completely different strategy, based on identification of root cause damage, and repair of that
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