Is a comparatively easy problem to solve.
You avoid foods with wheat, oats, barley and rye (which contain gluten). A lot of coeliacs
also need to avoid cows milk, and most likely all cow products (cheese, cream, butter, yoghurt etc.).
However, some people only need to avoid some of these as it is only one constituent of milk to which they react.
(See Section on Allergies).
I have heard recently that some coeliacs can take oats. Speaking as a celiac myself I definitely can NOT.
The only person who can possibly tell is YOU. Experiment only when you have time on your hands!
Apart from the most usual symptoms, e.g. diarrhoea, coeliac condition can manifest as arthritis, aching muscles,
headache, “flu like” symptoms, and also quite severe mental symptoms. A lot of “other” problems clear up,
permanently, when gluten is removed from the diet.
The good news is that so many people have discovered this, it is now much easier to get gluten-free products.
The major supermarkets all have excellent gluten free sections, containing all we require and even some of the
popular restaurant chains are marking “gluten-free” on their menus. Progress!