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Coffee, chocolate, and carbonated beverages

Many coffee lovers have to swear off java after getting a diagnosis of Crohn's.

"Anything with caffeine is really bad, chocolate is really bad," says Julie Novack, 44, a senior credit underwriter at Wells Fargo in Charlotte, North Carolina, who has ulcerative colitis.

Novack and other people with IBD can also have trouble with caffeinated sodas, while bubbly drinks—caffeinated or no—can be triggers as well.

Next: Alcohol