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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.