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Mistake #2: Filling up on gluten-free everything

"Probably the number-one mistake I see is people eating gluten-free products and thinking they're being healthy," says Mary Gocke, RD, CDN, director of nutrition at the Blum Center for Health in Rye Brook, NY. "But gluten-free products tend to have a lot of fillers in them." Rather than chowing down on g-free bagels and pita chips, focus on eating fiber-rich whole grains in reasonable portions.