It's a gloss: your intestinal microbiome is maintained because bacterial biofilms in the intestines constantly grow, but are also constantly scraped away by fibrous matter travelling through the intestines (the balance is sort of like bone remodelling.) If you eat only fiber while otherwise fasting, the scraping will occur without the regrowth. Combine this with a course of antibiotics beforehand and a course of probiotics (or a foecal transplant) afterward, and you can fully replace your microbiome.
I've been a long time IBS suffferer and I think yeast overgrowth plays a key role in my case. I took anti yeast medicines for a while and felt great. Should've taken probiotics at the same time.
Do you know of a book/source that sums all of these points up? (I'm going to try the 3 (5?) days strategy and understanding what's going on would add to the motivation.)
We know very little about the bacteria in our gut. Take it from someone who had to get surgery because of ulcerative colitis. Things might fuck up in your intestinal system and doctors who have been in the field for 20 years can only shrug. There's no book on that, I'd not suggest trying to fuck with your intestinal system (antibiotics + probiotics) like there's some science behind it. There isn't.
This is a very bad idea. Some healthy bacteria cannot be replaced once they're gone. You should only use antibiotics when the pros outweigh the cons, which is if you suffer from an infection.
I've never heard of a fiber only fast. What can you eat that only contains fiber?