My three boys have been avoiding a number of additives for many years now because of obvious affects on their behaviour and health. Last year my oldest son – then 8  years old - was diagnosed with Chronic Tic Disorder which is one step before Tourettes Syndrome. He could not sit still, having tics in his face, neck, shoulders and arms. After a period of time, I realised that this behaviour coincided with an increase in eating hot chips. I stopped my son eating hot chips and the tics went away. I have since tried him on hot chips and the same thing happens. The culprit is the synthetic antioxidant 320 (and/or 319) that appears in most chips and oil used for deep frying. However, manufacturers of frozen chips, and other products such as packet chips/crisps and dry biscuits do not need to list the additive on the label if the oil is less than 5% of the product. Not good enough! How can I help my son be “tic free” if we don’t know when these nasty additives are in certain foods? – by email