I had loose bowels for many years until I found Kefir
http://en.wikipedia.org/wiki/Kefir
My problem started in 1980 when I got pseudomembranous colitis (similar to C-difficile) caused by antibiotics. I learnt to control my symptoms at a tolerable level with yogurt, but last year I found kefir (the super yogurt). I make my own (for the price of the milk). It is the most wonderful health product I have ever found on the web. Dont pay silly prices for yogurt health drinks. This does all they do -better. Outlay? - less than a fiver to buy the grains, which go on reproducing themselves as long as you keep using them (same principle as yeast, or a ginger beer plant)