Some References:
1) Role of the Microbiome in Human Development - https://pmc.ncbi.nlm.nih.gov/articles/PMC6580755/
2) Human Microbiome Project - https://en.wikipedia.org/wiki/Human_Microbiome_Project
3) The Human Microbiome Project: Exploring the microbial part of ourselves in a changing world - https://pmc.ncbi.nlm.nih.gov/articles/PMC3709439/
4) The Human Microbiome: From Symbiosis to Pathogenesis - https://pmc.ncbi.nlm.nih.gov/articles/PMC3731629/
5) The Second Brain: A Groundbreaking New Understanding of Nervous Disorders of the Stomach and Intestine by Michael Gershon. This is a must-read neuro-psychology book.
6) Gut: The inside story of our body’s most under-rated organ by Giulia Enders. Another must-read book.
7) Finally; i came to know (have not browsed/read) of this definitive textbook Fundamentals of Microbiome Science: How Microbes Shape Animal Biology by Angela Douglas (via her Microbiomes: A Very Short Introduction Oxford series book) - https://press.princeton.edu/books/hardcover/9780691160344/fu...
https://pmc.ncbi.nlm.nih.gov/articles/PMC8061703/ is around where i started, some time after learning about https://en.wikipedia.org/wiki/Auto-brewery_syndrome
Checkout her other books too. They all seem fascinating.
The three things i find most fascinating in Biology are 1) Neuroscience, 2) Immune Systems and 3) Microbiome on our bodies. Together; they literally define who we are (mentally and physically), how we survive and how we coexist with our environment and yet there is no one book which brings everything together.
As a kid, i had read two classic books from the Soviet-era Mir Publishers Science for Everyone series which fired my imagination and sparked a lifelong interest in the Life Sciences. You might also find these (and others from the series) interesting (though old);
Science for Everyone – Ethology What Animals Do and Why? - https://mirtitles.org/2013/10/08/science-for-everyone-etholo...
Science for Everyone – Me Or Not Me - https://mirtitles.org/2011/12/22/science-for-everyone-me-or-...