I would argue that we do not really extend our lifespan by following healthy practices. Rather, we avoid shortening it. In other words, the body may have a certain natural lifespan potential, and habits such as smoking, obesity, poor diet, inactivity, excessive alcohol consumption, and chronic stress can subtract years from that potential. Healthy practices like intermittent fasting may simply help us preserve more of our lifespan we were biologically capable of achieving in the first place.
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