You know, there are better ways to get fiber into your system than prepackaged "cereals": fresh fruit, sprouts and vegetables for example, which are crawling with all types of bacteria. You know a bit of dirt (in your food) never killed anybody (unless it was infested with ecoli). Thing is you gotta eat the peel of the fruit and veges as well so it would be smart if they were (at least) organic and at best home grown. What about making up a batch of home made yoghurt and/or kefir/aryan/buttermilk? That'll do wonders for intestinal flora. There are also homeopathic treatments where intestinal bacteria are reintroduced into your system via ingestion. In closing there are also commercially available yoghurt and yoghurt drinks purposefully infused (infested!) with intestinal bacteria.
Oh, did I forget to say 30 minutes of moderate-strong exercise daily?
If all that doesn't get you sprinting for the porcelain throne I don't know what will!
Yeah I know I am not a TM doctor but not all problems require doctors!
PS Drink at least 1 and a 1/2 litres of water per day. Water, not tea, coffee, softdrinks or fruit juices.
PPS Cutting down meat consumption would help as well.