Taking a little (start with a quarter teaspoon, then gradually increase the amount) potato or corn starch in water once or twice a day helps to increase good bacteria in the colon. This should be taken with some other fiber, such as wheat bran.
Studies have shown that taking this starch/water mixture increased the good bacteria in the colon. Still, the good bacteria weren't propagating throughout the whole colon. Adding a little (wheat) bran together with the starch effected that the good bacteria spread throughout the whole colon.
Replied by Nat from Brooklyn, NY on 06/06/2024
Update.
The raw starch is not easy on the intestines.
Maybe, just using one fourth teaspoon (or a bit more) starch several times a week is enough. This together with some wheat or other bran.
Replied by Nat from Brooklyn, NY on 06/03/2026
Update 2 - The raw starch was really not helpful.