Well once you're able to establish your diet, it should bbe pretty easy. It's really unlikely that most people will be sensitive to all foods from the Feingold Diet. My son was only sensitive to dairy and some fruits and veggies, and not even the ones that he like anyhow. I do have to read labels though but I've gotten used to it.
My doctor suggested Ritalin too and was surprised when I opt not to. This diet works for us!