Why is the liver so weirdly regenerative?
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The liver's exceptional regenerative ability may stem from an evolutionary trade-off with cancer risk.
The author explores why the human body is mostly fragile except for the liver, which can regrow after injury. A unifying theory is that evolution balances regeneration against cancer risk: organs exposed to the environment (like liver, skin, intestines) are tuned for more regeneration and accept higher cancer risk, while protected organs (like heart, neurons) limit regeneration to avoid cancer. Exceptions like lungs (low regeneration, high cancer) and pancreas (moderate cancer despite low exposure) complicate the theory, as does the small intestine (high regeneration, low cancer). The liver's constant exposure to toxins from the gut may force its regenerative capacity.
What commenters are saying
Commenters split into two camps. One camp criticized the article as shallow speculation lacking scientific rigor, with one user calling it 'garbage' and 'pop science.' Another camp defended the piece, arguing that speculation and curiosity are central to Hacker News, and that the author's framework offers an interesting perspective on evolutionary trade-offs. Some commenters provided corrections, noting that adult neurogenesis does occur in the brain and that heart cancer, while rare, does exist in other animals.