My 11yr old son has been complaining for several weeks about having runny poo, he never lets me have a look so can't say for sure what it looks like... his diet is bad, always has been, since a baby, tried to make him but he just threw it up. He wont eat fruit veg or real meat...He lives on battered fish, chicken, bread, potatoes, (chips or roast) cheese spreed, will eat dry cereal with out milk, sausage rolls,sausages, yorkshire puddings (cucumber & peppers. if forced to) but drinks lots..