It's possible for certain foods to irritate your bladder, such as alcohol, aged cheese, artificial sweeteners, coffee, fruits, some nuts, processed meats, onions, rye bread, tofu, tomatoes, and yogurt. Try eliminating all of them, then adding them back to your diet one by one (a few days apart), to see if any aggravate your interstitial cystitis.
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The most common foods that make interstitial cystitis symptoms worse, says Victor Grigoriev, MD, a urologist at MountainView Hospital, are caffeine, alcohol, spicy foods and chocolate. In this video, he discusses how avoiding these foods might help.