I have been experimenting with soluble fiber this summer ie Benefiber and then oat bran wafers. They make my colon work great but they have created other health problems. I had to stop the Benefiber completely because it caused REALLY bad sinus headaches, the worst of my life. (it seems to speed my colon up too fast and irritates my sinuses) I then tried oat bran wafers. Although milder if I took a whole one several days in a row, that bad headache returned. I also chipped my front tooth last week biting a bag of pocorn open. Granted, I shouldn't have done that as I have soft teeth but this incident combine with sports injuries to arm and knee from golfing (won't go away)are leading me to believe that the fiber is leaching calcium and other minerals out of my system. Brother! I certainly can't afford to lose teeth and bone and have weak connective tissue. ( I have soft teeth) And I was not taking very much of these supplements!!######!!I may have to target fruit/flax as my bedtime therapy and stay away from supplements although they work like a dream. Maddening!