[throw_me_up]

Eat fiber. Meet the recommended amount and eat a diverse set of fiber which will feed different microbes in the gut. It will take some time for the gut to adjust to the new levels though. Expect gas, cramping, etc for a few days.

[EL_Loco]

Do you advise just fiber from natural foods, or do you take a fiber supplement (like those that come in powder form)? I guess the supplement route won't give me the diverse fiber types you mention, am I right?

[zargon]

Grandparent said eat, not supplement. Eating nutritionless food and then trying to backfill with supplementation is counter-productive.