The (funny to me) idea that also came from that was that we can remove our digestive systems, because "eating mainly for nutrients" turns into "eating just for enjoyment", and we have a tray in our stomachs that we tap out to empty the chewed food.
The truth is that our body is marvelously complex, and dynamically adjusts to many challenges. It does this so seamlesly that we don’t even notice. That is why people come up with ridiculous ideas like this because they are not consciously aware of how amazing their body is at taking care of the job of keeping them alive.
The closest to this tray idea in reality is an ileostomy. And while it is better than dying, it has many risks and negative consequences. The idea that otherwise healthy individuals would willingly under go such a modification to their bodies is ludicrous.
But yeah, there is a lot of stories about patients with bad outcomes with colostomy bags. It sure beats dying of course. As a general rule of thumb: every time you cut into a human there is a high chance of things going wrong. The more you are changing after you cut into them the more likely and more severe the sideffects will be. (Very rough approximation of course.)
This is something i constantly think about cyborgs. They are a a staple of scifis, and usually portraied as stronger and faster than regular humans. But every cyborg with lets say a cybernetic arm would be medically an amputee. Every amputee can tell you that stumps suck. They get infected, or get pressure sores, or their skin gets irritated, etc etc unless you are treating them just right, and even then sometimes they hurt when you did everything right. How would you even grow metal and muscle/skin together without the meat constantly pulling away and getting infected? That is the real scifi not the brain-computer interface.
It doesn't migrate all over, though. Serotonin in the gut doesn't go into your brain like many people assume.
https://www.psychologytoday.com/us/blog/the-athletes-way/201...
I'd note that this is a five year old article and I haven't heard of any followups. And the article itself may be misinterpreting the underlying actual research, which suggests that it's more about SSRIs:
https://www.nature.com/articles/s41598-019-50807-8
Still, I thought it was worth mentioning.
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Chemicals released by the gut microbiome can influence brain development, starting from birth. A review from 2015 states that the gut microbiome influences the central nervous system by "regulating brain chemistry and influencing neuro-endocrine systems associated with stress response, anxiety and memory function".[4] The gut, sometimes referred to as the "second brain", may use the same type of neural network as the CNS, suggesting why it could have a role in brain function and mental health.[5]
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This is also an extremely important discovery, but it will have profound implications on modern health and diets. Everything from glyphosate to fake sugars has been argued to be harmless because we thought that they were largely inert. In reality they are having substantial impacts on the gut biome - the potential implications of this cannot be overstated, and so shooting wild and fast would be poorly advised.
Without grain mills to prechew the food into fine dust particles aka flour, it would be practically impossible to overdose on sugar.
I mean sure you could also treat with weight loss and regular exercise, but it's a fun thought experiment.
I might also be crossing the streams on partially remembered text, but I believe the nano component of the blood was about engineered hemoglobin that was a more effective oxygen carrier, not glucose.