My 6 year old son is increasingly stroppy - I gather from threads on here that this is pretty normal and probably testosterone related. However, he seems to have really bad mood swings if he is hungry. He gets almost hysterical and so angry but as soon as we get some food down him he calms down. Should I be worried that there is a problem with his blood sugar levels? There is no diabetes issue in mine or DH's family so I don't really have any experience to go on