"I believe one of the problems is over consumption of gluten-containing grains, especially wheat, and the fact that it is genetically different from ancient wheat, " says naturopathic physician Hamish Everard.

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Officials said the team is concentrating on more than the two companies believed to have exported the melamine in wheat flour mislabeled as wheat gluten and rice protein concentrate.

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Gluten is a protein found in wheat, barley and rye (the wheat version gets most of the attention in American diets).

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The condition is triggered by an intolerance to gluten, a protein found in wheat, barley and rye - and therefore a common ingredient in many processed foods.

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