Just how many people are coeliac or wheat intolerant is unclear. Statistics for the EU fluctuate between 5%-10%, as figures hinge on whether to count undiagnosed sufferers.
The illness is caused by the body's inability to digest the gluten (protein) in wheat flour. The source of the intolerance isn't yet understood.
The quality of gluten-free bread varies. Pret A Manger has a gluten-free flatbread wrap; Gwyneth Paltrow (in her Goop blog) swears by a version with almond and coconut flour.
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