The study of intestinal flora has been plagued by a bias: namely, that the studies were done on an already “industrialized” population with eating habits that could hardly be called “natural” Now a research team has studied the African Hanza hunter-gatherers and has drawn important conclusions for what a health gut flora would be.
It has been shown over the past few years that a healthy intestinal flora prevents a major part of autoimmune diseases. Considering that 70% of immunity stem from the intestines, that is not surprising. Probiotics have rightfully gained importance as nutritional supplements. Most probiotics, however, are based on lactic bacteria — and many nutritionists have pointed out that maybe consuming milk the most natural thing to start with, unless it is mother’s milk.
After some extensive research on this, I have concluded that the better probiotics to take would be soil based microorganisms (SBOs). Even though these make up the smaller part of available probiotics, they are commercially available.
See the article about the Hanza here:
https://www.wired.com/2014/04/hadza-hunter-gatherer-gut-microbiome/