Metamucil or its generic is another fiber to try. I agree with you, it's worrisome to have all that stuff filling your intestines. But try some of the products listed here before going to the doctor. From my experience, the doctor will tell you to try the products as long as you don't have symptoms other people have mentioned, like blood coming out of you. I've been using the Dulcolax generic once a week because increasing water and relying on fruits and vegetables isn't doing it for me. Good luck!