I'm surprised your doctor advised you to reduce roughage - it usually helps your bowels.
These foods are high in roughage!
* Wholemeal, granary and softgrain varieties of bread
* Jacket potatoes, new potatoes in their skins and baked potato skins
* Wholegrain breakfast cereals, eg. Weetabix, branflakes, unsweetened muesli, Shreddies and porridge oats
* Wholemeal pasta and brown rice
* Beans, lentils and peas
* Fresh and dried fruits � particularly if the skins are eaten
* Vegetables � particularly if the skins are eaten
* Nuts and seeds
* Wholemeal flour