It's SOLUBLE fiber that you want to maximize. Some is better than others because it aborbs MORE water. Psyllium can attract water and increase many many times it's weight and volume and thus swell to a very large soft mass which eases the colon's burden and allows for a "smooth passage." It will cure both constipation and diarrhea and ease any cramping from IBS by keeping the bowel filled. With INSOLUBLE fiber it's pretty much a few grams in, a few grams out...the bowel will barely notice it.
Also check out the soluble fiber on the back of a can of beans and you'll soon add bean soup to your menu every day!
If you have real problems, then try to get enough fiber to ameliorate them. If it takes 10 grams, so be it...20, fine.
Our hunter gatherer ancestors got MUCH MUCH more fiber than we can ever hope to get with out processed food. I find that if things are ROUGH it can take 2 or even 3 rounded tsp. of psyllium a day for long term comfort.....and my can of beans (black bean soup my fave.)
[This message has been edited by zip2play (edited 09-20-2003).]