Cooking food by shallow or deep frying increases the overall fat content. Unfortunately, other fatty foods beyond dairy can cause flare-ups of diverticulitis. For this reason, any food that has been through a deep fat fryer or even fried on the stove at home is a poor option for people with diverticulitis. People with diverticulitis should try to eat foods prepared using methods that do not require oil or grease. Steaming, baking, and grilling are all good alternatives. If fried food can't be avoided altogether, limiting the amount of oil used during cooking is a good precautionary measure.

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