Why oats are not gluten-free
Oatmeal, oats are not gluten-free. Bob's Red Mill Rolled Oats are not gluten-free, technically yes, scientifically no. They are not gluten-free, they are wheat-free. Oats and by extension oatmeal contains a form of gluten, avenin. Gluten is a composite of storage proteins representing gliadin in wheat, hordein in barley, secalin in rye and avenin in oats. So when gluten-free oats are discussed, it means they are free from wheat contamination (gliadin, hordein and secalin). Avenin is an essential part of oats and will never be truly gluten-free even if they are described as being gluten-free. I think why this seems conflicting is the popularity of Bob's Red Mill's Gluten-Free Rolled Oats, which are American and in America gluten-free is defined as 20 parts per million of gluten or less (20ppm). Under the Australia New Zealand Food Standards Code, gluten-free is defined as 3 parts per million (3ppm) - globally one of the strictest standards. Oats and their products are not permitted in foods that are labelled gluten-free, this oatmeal is therefore not gluten-free but if you can tolerate oats, eat oatmeal.
That said if you can eat oats, eat oats. They are supremely good for you. And keep in mind oatmeal is not for breakfast, oatmeal is for when you feel like oatmeal. A 1944 marketing campaign launched by General Foods to sell more cereal, “Eat a Good Breakfast—Do a Better Job,” and lobbyists made breakfast 'the most important meal of the day' - cereal has aggressive marketing. And while the combination of morality and science would suggest high demand for oats, in industrialised countries, demand for oats have been modest. So buy oats.