Other dietary complications sometimes include hypomagnesaemia and decreased absorption of B-12 and folic acid, however due to the integrity of the small intestine other nutrient malabsorption is unlikely to occur. As far as body composition is concerned obesity has been shown to be a risk factor for peri- and postoperative complications in colorectal surgery (e.g. peristomal dermatitis, stoma stenosis and prolapse). A prospective trial examining measures that can prevent readmission for dehydration and other nutritional considerations related to this group of patients is definitely required.