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It would behoove the author to take extreme care when writing exactly what science has proven those activities can do. We cannot vanquish APOE4-driven Alzheimer's or BRCA1/BRCA2-related breast cancer by riding a bike and wielding an asparagus spear, at least as far as science currently knows. But we can stave off many age-related maladies for a while this way—and that is on its own a worthy endeavor.