A gluten-free diet is good for those who can't digest wheat or have celiac disease, but the diet is becoming popular among health-conscious celebrities, such as Oprah Winfrey. That popularity means manufacturers such as General Mills and Anheuser-Busch InBev are creating products to keep up with the trend. The gluten-free market is expected to reach $1.68 billion in the U.S. and $3.38 billion worldwide in 2015.

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