Our very aggressive five year old improved dramatically on the elimination diet. We were quite surprised and relieved that he passed most of his challenges except for a few additives such as artificial colours. However, after several weeks of excellent behaviour, he gradually deteriorated to the stage where he was uncontrollable, breaking windows and punching others. We were at a loss to explain the downturn. Eventually, we found the culprit - unlabelled BHA 320 in vegetable oil used in a gourmet garlic paste that we had started to use more frequently. There was no effect when it was eaten occasionally, but it caused catastrophic results when used every day. – reader from the NT