Yes my soon to be 5 yr old son was deemed allergic to every food possible, i.e., eggs, milk, soy, wheat, garlic, nuts. He had the rast tests which showed these and then recently had blood tests which confirmed the eggs and milk allergy. However, the others are still questionable until he actually shows a reaction. I just know that our family has allergy to milk and my mom says she stays away from whole wheat. I am allergic to garlic and milk so I stay away from those but everything else so long as it is in moderation seems to work okay still.
I have no clue why the doctors won't specifically say how severe the allergy is like they do with pollen, etc., but it seems if your body is willing to process what you eat even if it shows an allergy to it, you are okay.
My way of doing things - just for the time keep most of these out of his immediate diet but try every now and then to introduce a little to him and make sure there are no problems.
You will know what feels right as you have the peanut allergy.
Good luck!