Drink lots of water too that helps things keep moving too. If you do eat a lot of bran with no water it may block you rather than do the opposite. I find green veggies like romaine and broccoli, baked beans and other bean product make things flow smoothly for me.
Also, if you take lightly ground flax add a tablespoon to your cereal or juice morning and night, it will help a lot. Flax is one of those wonder grains that if you are constipated it will regulate and if you have diareha it will firm things up.... I know, I know, TMI, but it's the truth
. A doctor recommended this to my dad when he had prostate cancer and the radiation was affecting his movements, it worked very well