The Food Allergen Labeling and Consumer Protection Act of 2004, which legislated the requirement for food allergy labeling guidelines, also required the FDA to implement rules for voluntary gluten-free labeling guidelines by August 2008.

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Scientists at Leatherhead Food International measured latex allergen levels in 21 types of food packaging.

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The tests are not perfect but can be useful in conjunction with doctor-prescribed elimination diets and food challenges, which involve ingesting the allergen under a doctor's supervision, Pistiner said.

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