Just a quick note: You have to see your gut flora as an actual flora - like a forest. It doesn't get sunlight, you feed it nutrients. Whatever doesn't get fed d

Just a quick note: You have to see your gut flora as an actual flora - like a forest. It doesn't get sunlight, you feed it nutrients. Whatever doesn't get fed dies, and what gets fed multiplies. Now the more wishiwashi things is that some effects have been noticed, like if you have a biome that loves straight sugars, it will lead you to want to keep feeding it sugars, since you're very efficient at getting energy out of it, since you've cultivated a large amount of bacteria that does that well. Some can also affect their environnement to help themselves and damage others. So it's tough to starve the "bad" and feed the "good". Ideally, your gut would be used (and optimised) to a whole and full diet that gives you all nutrients. All this to say - you can take probiotics if you want, but if you don't feed the bacteria you put in there, it's gonna die. So you have to both change your diet AND take probiotics. A way to do both? Lactofermenting! Just take some foods you like, lactoferment them and eat the non pasturised food. You are selecting for bacteria that feeds on foods you like, and putting both them and their food in your gut. They are going to thrive, while your old flora won't like it. I recommend making your own sauerkraut or kimchi to start, takes 10 minutes and 5 days of waiting. Costs 2$. Expext to get farty - that's the bad stuff dying and releasing gas. That just my ramblings and I don't have solid sources on hand, but if you read up on poop transplants this kind of makes sense. Edit: If you're into sourdough, making a starter is basically selecting for wheat digesting bacterium. So you're kinda doing the same with your flora! (Sourdough isn't a source of probiotics since it's cooked, it's just an analogy)