with us, when the behavior started we looked back at what he had had that was new, which was juice and cordial ... we then looked at the ingredients, then notcied the pres 223 was also in cheerios which the one time he had had them he had night mares for days and physo behaviour, so we put 2 and 2 together, it can be overwhelming but the best thing is to watch for the out of control behaviour and take note of what he has eaten etc then what colors preservatives are in them if that makes sense eventually you willl see a pattern