D.B.
A friend of mine had a child with 60 food allergies. SIXTY! Pineapple and many other fruits were on the list. It's a nutritional deficiency. Her child is allergy free now. She did it very simply but with consistency. It's more than "eating right" even food adults. Food "allergies" are on the rise, but they aren't true allergies, just an inability to process certain foods because of missing nutrients. Let me know if you want to talk with her. It's an amazingly simple fix, much easier than a lifetime of elimination diets.