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According to the Wikipedia entry on telomerase, the enzyme "allows for replacement of short bits of DNA known as a telomere, which are otherwise lost when a cell divides via mitosis.... A variety of premature aging syndromes are associated with short telomeres." Besides slowing the aging process, Telomerase also help fight cancer and other diseases.
As always, the science is presented as if eating real food acts like a drug that slows aging. The reality is that processed and industrialized foods artificially shorten life.