There's a few things you can do (and you don't need to do all these to gain your gut flora back, but this list is optimal if you do it all): 1) Drink Raw milk. (if you can find it. Never drink regular milk from super markets/grocery) 2) Eat Raw butter. (same as above.) 3) Eat fermented foods, like sauerkraut, kimchi, greek yogurt, etc... 4) Spend like 40-50$ and get yourself some bacteria from the refrigerator of like whole foods or something. The ones that are off the shelf are not alive. Make sure it's Bifido bacteria. I like this: https://www.florahealth.com/us/products/super-bifido-probiotic/ I also like to take like 5 of those pills on an empty stomach and down it. You can eat as much as you want in reality. 5) Look into Kefir and if you can, look into how to make it yourself using your own grains (use the raw milk with kefir grains to make a super probiotic concoction. 6) Make bone broth with grass fed / pasture raised animals. That shit heals leaky gut in days. (see #9 below) 7) Eat raw eggs (at a minimum the yolk) 8) Cut vegetables out of your diet 9) Know who Weston A Price is: https://www.westonaprice.org 10) Watch this video and start learning about Aajonous Vonderplanitz: https://www.youtube.com/watch?v=LoeXr4LVev4 --- It won't take long to get your gut flora back in shape actually. You can even get it back within a couple of days. BUT, don't fuck it up by eating shit that fucks up your gut like legumes, especially peanut butter. That shit will give you leaky gut and will take time to repair.