Did anybody watch this programme last night? Hope I get the summary right:
Michael Mosley did an experiment on gluten free/gluten diets on 60 volunteers for 6 weeks. Some of the volunteers were gluten intolerant others had no problems with gluten. Volunteers had to document their symptoms. Gluten was introduced into their diets without them knowing. The results were of statistical significance but there was no significant result in the blood tests. It is worth watching.
Also he reviewed home tests for intolerances which was interesting.