Your body doesn't fully replace itself every seven years
The belief that your body fully replaces its cells every seven years is a myth; different cells regenerate at vastly different rates, making you a dynamic mix of old and new.
The popular idea that your body completely renews its cells every seven years is a myth. While many cells do regenerate, different parts of you have vastly different lifespans. Your skin renews every 10-30 days, and red blood cells last about 120 days. Liver cells can regenerate within months.
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