For some time now, lots of people have been circulating the claim that we renew our entire bodies every 7 years. It may be repeated often, but is it actually true?
As Hank Green from SciShow explains, the claim makes sense on the surface because many cells in our body are constantly dying out and being replaced. Using that logic, over time, we should be able to have a brand new body after a while. But not everything regenerates itself like, for instance, our skin does.
In fact, learning what cells and tissues do or don't replace themselves throughout our lifetime seems to correlate with common age-related conditions, and scientists learn to target these processes as therapeutic treatments.
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