J.W.
Actually most foods do NOT contain this. They are the *real* foods. They are the foods you buy from usually the outer perimeter of stores - the fresh fruits, vegetables, eggs, and meats. There is also grains and grain-like products with no gluten, such as "buckwheat" and "quinoa". We also make brown rice. You can go to whole foods markets and get Daiya cheese that has no gluten, dairy, or soy. We make spaghetti from spaghetti squash and buy spaghetti sauce from our local food co-op that has no added sugar or much of anything. I like adding extra garlic and seasonings already made up called "Mrs. Dash".
There are so many recipes and products now-a-days - even Walmart carries gluten-free products, although we mostly stay away from processed foods. Here are some recipes: http://www.foodsensitivityjournal.com/
Also look for recipes pertaining to "paleo" diets which will all be natural with no gluten, dairy or sugar.
And don't forget the probiotics!