Here’s some info about prebiotics:
Foods with FOS contain prebiotics.
” onions, chicory root, garlic, asparagus, jícama, and leeks. Some grains and cereals, such as buckwheat, also contain FOS. The Jerusalem artichoke and its relative yacón have been found to have the highest concentrations of FOS of cultured plants.”
Miracle fiber (aka inulin) is a great source of FOS and I add it to my yogurts, breads, etc.
Buckwheat, oat bran and teff are other examples of prebiotics.