I agree with Bug: Deal with the hidden allergies now to prevent long term issues. After a lifetime of food allergies, I developed all sorts of hormonal issues, fibroids in my uterus, and a chronic pain disease called Fibromyalgia. I went to my regular allergist to get re-tested and NONE of my already known allergies showed up. Then I got a full allergy test (IgE, IgA, and IgG) test done through my integrative health specialist (MD trained in Holistic Medicine). It showed all of my already known allergies plus some new ones...wheat, dairy, and eggs. I had already been on a mostly gluten free diet for over 2 years. But once I eliminated dairy and eggs, my Fibro pain dramatically decreased.
Also is doing a lot of research on thyroid, adrenal gland, hormone, and chronic pain diseases....you always find a strong link between them and food allergies.
Another thing is that the tests given by the allergist don't always detect everything. The most complete test is the IgE, IgA, and IgG test plus the food elimination and then reintroduction to see how the body reacts. For me once I eliminated wheat, my digestive issues went away (I was tested for Celiac and it was negative).
Because of my Fibromyalgia, I also have to stay away from nuts and soy.
Here is what I can no longer eat due to food allergies or because it aggravates my Fibro pain:
wheat, wheat gluten, dairy, casein (the dairy protein), eggs, nuts, peanuts, soy, onions, tomatoes, salmon, apricots, oranges of any kind, shellfish, chocolate, and eggplant.
There are foods out there that he can eat. It will just take some research on your part. And yes, it is way more expensive than regular food. I get a lot of my packaged foods from Amazon.com, Sprouts Marketplace, and Henry's Marketplace. Occasionally I get some stuff from Trader Joe's or Wholefoods.
Brands I like that are allergen free are:
Namaste
Nana's
Enjoy Life
Plus there are TONS of allergy friendly recipes that you can find for free online.
Good Luck!
S.