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This article discusses some findings. The findings show a possibility: gut bacteria may coexist in the brain tissue of mammals. Humans are mammals. There is room for skepticism in the endeavor so far. Example: contamination of cadaver brain tissue samples.
The reason for this position on the paper is the blood brain barrier. It acts to prevent bacteria from colonizing brain tissues and it is believed that it does that task well.
https://www.sciencemag.org/news/2018/11/do-gut-bacteria-make-second-home-our-brains
If it turns out to be correct it may help to explain if and how the human gut microbiome influences humans.
Debate on obesity and the microbiome, this review paper is a relevant example:
https://www.ncbi.nlm.nih.gov/pubmed/27255389
The reason for this position on the paper is the blood brain barrier. It acts to prevent bacteria from colonizing brain tissues and it is believed that it does that task well.
https://www.sciencemag.org/news/2018/11/do-gut-bacteria-make-second-home-our-brains
If it turns out to be correct it may help to explain if and how the human gut microbiome influences humans.
Debate on obesity and the microbiome, this review paper is a relevant example:
https://www.ncbi.nlm.nih.gov/pubmed/27255389