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.

FORBES: Setting the Record Straight on Gluten-Free Eating and Celiac Disease: An Entrepreneur Takes on Washington

The critical requirement is transparency, which means proper identification and labeling.

FORBES: Inside Forbes: The Birth of Brand Journalism and Why It's Good for the News Business