Kathryn Monk says nutritious, naturally gluten-free food is widespread in cuisines of Africa, Asia, the Middle East and South America Your article on the rising cost of gluten-free foods highlights a genuine problem ( Gluten-free basics ‘now a luxury’ as price of a small branded loaf nears £4, 30 May ). However, I was struck by how narrowly the discussion was framed. Much of the article focuses on the affordability and availability of gluten-free versions of bread, biscuits, breakfast cereals an