If you look at the packet of All Bran and see how much additive there is ..eg sugar etc ...you are far better off eating those nine spuds.
It is vile stuff which just fills you up and eating it regularly will have you sitting on the loo all day.
This is very interesting..scroll down to "Conclusion"
http://www.second-opinions.co.uk/bran_and_canc er.html
I suffer with IBS and my GP told that you can overload on fibre and that these things such as All Bran etc are just a gimmick.Your "five a day " should provide all the fibre you need.