psyllium is great, though you have to take a lot in capsule form to get an effect - if you can bear the powered husks, two teaspoons a day in liquid does the job. Fish oil helps too (PP - to do with good eicosanoids) a tablespoon a day, good for all sorts of other reasons too.
Neither of these is nice to swallow (combine them in one yucky drink?), but hey, its over fast and the effects are worth having.
Good luck, Jay