I had pathogenic parasites damage my intestines, and the damage affected other organs, especially my liver. I am fat intolerant, except for medium chain triglyceride oil, also called MCT oil, the fat from yogurt made from raw goat milk, and my latest addition of nut milk. I get sick even with bone gelatin broth unless the fat is fully skimmed off. I can't digest other proteins nor starches. I am severely malnourished. "Secure" is keeping me alive, along with lactic acid fermented foods. In time, trusting the body's ablility to heal itself when it gets the proper nutrients, the intestines and liver will heal.
There are beneficial yeasts, sacchromyces boullardi for example, and yeasts in keifer and raw apple cider vinegar. However, these are too potent for me because I have so much dysbiosis. My liver can't handle the many toxins from the die off of unfriendly microorganisms, and I get very sick.
The fat probably works because during fat digestion your liver secretes bile into your small intestine and lubricates your intestinal walls. Bile also regulates the quantity of your friendly bacteria, and stimulates peristalsis. It is my understanding that the MCT oil doesn't help much with bile flow.
Oddly, the intestines need to be well populated with friendly bacteria for the bile to flow. Apparently my liver is producing "toxic" bile, which is harmful to the beneficial bacteria.
This information was good to remember. Because of your post, I decided that my next food addition will be fermented cod liver oil.
Thanks for your help.