This article gives an overview:
http://www.adhdenvoeding.nl/cms/wp-content/uploads/2012/12/A...
In the first table, second column (RCTtype) everything starting with DB is a double blind trial. (5 in total)
Pears/Apples? It has something to do with the hypo-allergenic qualities of pears, rice, turkey and most vegetables. But I'm not a food scientist.
> The parents and teachers who filled in the questionnaires could not be blinded as they had to supervise the food intake of the child and knew whether the child was following an elimination diet.
Do you have a reference of a similar article with a double blind test?
Another question: Pears, apples and quinces are very related plants. Why pears are safe and apple not? http://en.wikipedia.org/wiki/Malinae