Just to add to the Y-east conversation from PB's

From MOUTH to ANUS, is a continuous tube that NOT INTERNAL to your body. It is like your little personal pouch of 'soil' that you carry around with you. This 'SOIL' is ALIVE with billions or trillions of microorganisms in a healthy person. Understand that your intestines 'absorb' the waste products of these organisms, and the food you put in your mouth feeds your microbiome.

This is a symbiotic relationship. Now understand that if the balance, or diversity of microbes are not at a healthy state, this directly will effect YOU.

Some further reading…

https://hormonesbalance.com/articles/anti-candida-articles/candida-yeast-overgrowth-creates-hormonal-havoc-part-1-surprising-symptoms-causes-tests/

https://kresserinstitute.com/gut-hormone-connection-gut-microbes-influence-estrogen-levels/

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5641835/

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4940716/