I found this a problem when I first found out I was coeliac. I take psyllium husk every morning, plus enormous quantities of veg in my diet. Between the two, this keeps me "going". I buy my psyllium husk from lepicol.com, and I take a teaspoonful first thing in the morning in very dilute fruit juice. I have tried the psyllium husk powder that I buy for gluten free baking, but I found it harder to mix and to drink.Most of the substitute carbohydrate foods seem to be lower fibre than the wheat-based foods we used to eat. I have been much better (and feel healthier) since I stopped buying ready-made gluten free food and started cooking everything for myself, using wholefoods. The processed stuff is very low fibre and high sugar, and both are factors in the constipation problem.
You might find that ground flaxseeds or physillum husk (Holland and barratt sell this as "colon care") would help - both are great for helping regularity.
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