Stuff You Should Know Selects: Does the body replace itself?
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May 6, 2023 Discover how the human body regenerates itself at varying rates, with some cells taking just a few years while others linger longer. Explore the philosophical implications of these biological changes on personal identity. Learn about the essential nutrients that sustain us and the fascinating science of heart muscle cell renewal. The conversation also touches on the relationship between health, environment, and the quest for longevity, all tinged with light-hearted philosophical musings and playful critiques of grammar.
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Body Regeneration: Myth vs. Reality
- The 95% body regeneration per year is a myth based on flawed radioactive isotope studies.
- Newer research uses carbon-14 dating from nuclear testing to accurately track cell regeneration.
Carbon-14 Dating of Cells
- Dr. Jonas Friesen used carbon-14 spikes in tree rings from nuclear testing to date human cells.
- This method revealed more accurate cell regeneration rates, debunking the 95% myth.
Cell Lifespan and Regeneration
- Human cells are on average 7-10 years old, but regeneration rates vary across different tissues.
- Cell regeneration is fueled by nutrients and involves DNA replication.