His behaviour was affecting his learning at school. A Yorktest Food Allergy test identified that he was intolerant to milk. Iain had been in the habit of regularly drinking up to two pints of milk a day. Within a week of cutting all dairy products from his diet, Iain’s mother began to notice a difference in his behaviour. He was less excitable, more settled, and could concentrate better. Over the following months, others problems began to reduce significantly. He began sleeping through the night almost without exception and no longer needs the steroid medication for his asthma. On the odd occasion when some milk slips into his diet, some of his behavioural problems and the insomnia return with a vengeance – thankfully, says his mother, only temporarily.