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October 24, 2014

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Michelle Marinelli and her son Joshua check out a box of gluten-free ice cream cones at a Wegman's Food Market in Woodbridge, N.J., Jan. 31, 2014. More than 1 in 10 households are buying some gluten-free foods, and the fast-rising sector that was thought to tally $10.5 billion last year could top $15 billion by 2016, according to one market research firm.

Matt Rainey / The New York Times

Michelle Marinelli and her son Joshua check out a box of gluten-free ice cream cones at a Wegman's Food Market in Woodbridge, N.J., Jan. 31, 2014. More than 1 in 10 households are buying some gluten-free foods, and the fast-rising sector that was thought to tally $10.5 billion last year could top $15 billion by 2016, according to one market research firm.