Smith R G, Rowe M J, Smith A N, Eastwood M A, Drummond E, Brydon W G
Age Ageing. 1980 Nov;9(4):267-71. doi: 10.1093/ageing/9.4.267.
A study comparing the effects of bran and ispaghula in constipated elderly patients is described. Ispaghula and bran increased the wet and dry stool weight. There were no serious side-effects and no change in colonic pressures. The use of these bulking agents is shown to be better than the traditional use of laxatives in the elderly.