Popular in its day, the diet has since been referred to as an "outmoded treatment"; there is no good evidence that it is effective,[1][2] and it is difficult for people to follow.
Even today, parents are advised to limit their purchases of mouthwash, toothpaste, cough drops, perfume, and various other nonfood products to those published in the Feingold Association's annual Foodlist and Shopping Guide.
[7] According to the Royal College of Psychiatrists as of 2014[update] the diet prohibited a number of foods that contain salicylic acid including apples, cucumbers and tomatoes.
[7] Although the diet had a certain popular appeal, a 1983 meta-analysis found research on it to be of poor quality, and that overall there was no good evidence that it was effective in fulfilling its claims.
The committee widely published its preliminary report concluding that "no controlled studies have demonstrated that hyperkinesis is related to the ingestion of food additives.