We end up with corn due to gov't intervention and the corn subsidies. It wasn't that way until the mid-80s and then a lot of companies switched to corn rather than sugar for sweeteners. A lot of research is going into how the US is obese due to high fructose corn syrup.

With a wheat allergy, can you eat bread at all? I'm assuming not. Wheat Gluten is a problem here in the US, to the point many companies are putting on their packaging "Gluten Free" due to the scare a couple of years ago. A wheat gluten was to blame for hundreds of ill dogs and quite a few dead dogs. If it got into the pet food, it could get into human food, so hence the new packaging.