Less energy, can’t handle a trip out without sitting down. All this stuff, it becomes harder and harder as we age. Why?
In: Biology
Nobody really knows. It’s in the same category as aging, which nobody really understands either. In theory, every cell in the body should regenerate a perfect, beautiful copy of itself, and we should never have any signs of aging, slow down, degradation of function. The reality is clearly not that, but nobody really knows why. Might be accumulated DNA damage. Might not be. Might be telomeres. Might not be. Might be free radicals. Might not be. Nobody knows. Very active area of research.
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