I'm confused about what type of fiber is better for constipation. I've been reading about the differences between soluble and insoluble fiber. I understand that soluble fiber absorbs waters and helps hold stool together and that insoluble fiber does not absorb in water and it helps push everything through. I have had constipation problems for years now and have used fiber off and on. I have had one GI put me on insoluble fiber (told me to put unprocessed wheat bran on top of my cereal in the morning), which did seem to somewhat help. And another GI tell me that insoluble fiber wouldn't help and instead to use soluble fiber (psyllium in particular), which didn't seem to help at all and in fact seemed to make things worse. I'm convinced that insoluble fiber seems to be better for me. And from doing a search on previous posts it seems that people on the board usually recommend soluble fiber for D-types and insoluble fiber for C-types (though I know some C types have had success with soluble fiber as well). What I don't understand is why all the soluble fiber supplements (e.g., Metamucil, Konsyl, Fibercon) are marketed towards constipation when it seems they work better for D and for C insoluble fiber is often best. Are there any insoluble fiber supplements on the market? And I wonder if different types of constipation require different types of fiber. For instance, if you have a transit problem maybe soluble fiber helps, but if you have an incomplete evacuation problem than insoluble fiber helps. Tara