Restricted elimination diet for ADHD: the INCA study

Abstract

[...] the parents and teachers were aware whether the children received the elimination diet or not in phase 1, and that the children entering phase 2 received the challenge foods (the only information the parents and teachers were blind to pertained to whether the challenge foods were low or high IgG foods). [...] in both the control and diet groups, the beliefs and expectations of parents and teachers about changes in the ADHD symptoms could have been influenced by this knowledge.