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Dairy

Because Crohn's disease can damage the digestive tract, it can also cause lactose intolerance, an inability to digest the sugar found in milk and other dairy products.

If dairy causes bloating, gas, or aggravates other symptoms, you may want to try soy or almond milk instead of cow's milk. Choose harder, aged cheeses like Parmesan, Romano, or cheddar instead of soft cheeses like mozzarella or ricotta.

"The harder the cheese the more aged it is, the less lactose it has in it," says Dalessandro.