my son is eight , been diagnosed 30 months, he has typical diet for someone with cf. ie;high calorie. we have been told to fill him up on junk food , biscuits ,crisps, pop, pizza , ice cream etc. joe's behaviour has snuck up on us over many months. he is hyper. naughty, forgetful, no concentration. help !!!! is it his diet????????<img src="i/expressions/face-icon-small-frown.gif" border="0">