The whole point is that we are constantly finding causal, not casual relationships with our microbiome.

Just last week there were two significant discoveries:

For what is being found in long Covid for example, a promising hypothesis is viral persistence in the gut causing major dysbiosis and leading to lower production of serotonin. And we even saw the transfer of Alzheimer’s symptoms from an old host to a young one.

I think it just shows how important microbes are in our lives and what a strong influence they have.

https://www.pennmedicine.org/news/news-releases/2023/october...

https://academic.oup.com/brain/advance-article/doi/10.1093/b...