In the absence of clear confirmation or refutation of the results of the earlier study and in an attempt to meet some of the criticisms, we undertook the current study using a similar design, but with improved methodology and clearly defined outcome measures.
MethodsChildren were referred by general practitioners, paediatricians, and psychiatrists to a special diet and behaviour clinic set up at the Hospital for Sick Children. All children accepted for the study met DSM III criteria for attention deficit disorder with hyperactivity,10 were between 3 and 12 years old, and had IQs above 70. Where children were already on diets their parents were asked to take them off the diet for a week before the initial interview.
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