Spent good amount of time on reading about it, some books I read:
* 10% Human: How Your Body’s Microbes Hold the Key to Health and Happiness (https://www.amazon.in/10-Human-Microbes-Health-Happiness/dp/...)
* Gut: The Inside Story of Our Body's Most Under-Rated Organ (https://www.amazon.in/gp/product/938528861X)
* Brain Maker: The Power of Gut Microbes to Heal and Protect Your Brainfor Life (https://www.amazon.in/dp/0316380105)
also watched the course on Coursera about Microbiome (https://www.coursera.org/learn/microbiome), it was an eye opener.
Get dozens of book recommendations delivered straight to your inbox every Thursday.