All those experiments start with a very restricted diet and then they start adding apples, pork....
The restricted diet consists of what is considered safe food. ( A pear for example)
Double blind means that nor the participants nor the observers know which of the two groups follows the highly restricted diet. The participants are young children.
The article you cite has not a double blind experiment:
> 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?
All those experiments start with a very restricted diet and then they start adding apples, pork.... The restricted diet consists of what is considered safe food. ( A pear for example) Double blind means that nor the participants nor the observers know which of the two groups follows the highly restricted diet. The participants are young children.