Why Is the Human Body So Crap Except for the Liver?
Why is the liver so weirdly regenerative?
The human body is a mess: kidneys decay, gums recede, neurons never regenerate, and transplants often fail. But the liver can regrow from half its size without scarring. The reason? Cancer. Evolution trades regeneration for cancer risk, and the liver pays the price because it must constantly detoxify. This speculative theory explores why some organs are fragile and others are not.
Letting the telomeres get shorter is not a mistake. It is a deliberate design decision.
- senfiaj
Most of the body doesn't regenerate because there was not enough evolutionary pressure. Even with regeneration you could still easily die from some severe injury, blood loss or disease. While salamander regeneration is impressive, it has its limitations. For example, no known adult salamander can regenerate an entirely removed eye. Also if you chop a salamander, it will not regenerate like a Planarian worm, it will just die. And a fun fact, Axolotls can regrow a limb yet cannot regenerate an adult eye lens.
Also, although the article is mostly true, there are some inaccuracies:
>> Neurons and cardiac muscle cells don't reproduce after childhood
There is some evidence showing a slow cell turnover in cardiac muscle, estimated around ~1% per year in young adults, falling toward ~0.5% in older people. Most neurons don't regenerate, but there an evidence that some parts of the adult brain (such as hippocampus) still produce new neurons, although the number is very low.
Liver regeneration is not perfect either: https://www.youtube.com/watch?v=rOv7Sr3X-eo .
- cityofdelusion
The author suggests humans are overturned to repairing skin and blood, but I strongly disagree. People with problems with wound healing can face significant disability and mortality. Wound healing allows us to have surgery and close up with simple sutures. A lot of complications post-surgery in humans and other animals are specifically from impaired wound healing capability. It’s a good trade-off: nearly everyone will eventually get cut open by accident or on purpose. The skins ability to heal is so amazing that many types of wounds require nothing other than some cleaning, the body will fully clot, bridge, build, and scar back to most retained function. Wound healing allows us to heal large burns and even simply leave many wounds open to air.
Complications with healing are pretty brutal. Necrosis, amputation, infection are all common without the built-in cascade we have.
- Noe2097
> And even after taking [immunosuppressants], there’s a 30% chance the kidney will be rejected within 10 years. This is not helpful.
To the author: thank you, you made my day. It had been a very, very long time since I last read an article on the Internet that felt written by a human being - with humor, some poetry, and science.
- kevin_thibedeau
> but the process is slow and clumsy and can only produce tiny blood vessels.
This isn't entirely true. I have notable damage to one side and in the recovery process there was a significant increase in the visibility of the surface veins on that side. It's still clearly there years later. Existing vessels can grow larger when repair processes kick in.
- epcoa
"Some day, your immune system may decide to attack your pancreas."
Immune attack of the pancreas is usually a disease of youth. Type 2 diabetes which is overwhelmingly the diabetes associated with aging is not an autoimmune disease.
- gradus_ad
To solve cancer we just need to engineer extremely redundant genetic controls for cell reproduction.
- joshmarinacci
Many if not most of these oddities about humans come down to either they don’t affect reproduction, or because humans are social animals. Menopause makes sense because a grandmother will have more successful descendants if she stops having babies and helps her daughters with the grandkids. I would guess the few other species that exhibit menopause are also social animals.
- vconnor
The punishment for Prometheus stealing fire from the Gods and gifting it to humanity, was to be chained to a rock and having an eagle feed on his liver which would regrow the next day.