"While Crohn’s disease may not be the result of bad reactions to specific foods, paying special attention to your diet may help reduce symptoms, replace lost nutrients, and promote healing.

For people diagnosed with Crohn’s disease, it is essential to maintain good nutrition because Crohn’s often reduces your appetite while increasing your body’s energy needs. Additionally, common Crohn’s symptoms like diarrhea can reduce your body’s ability to absorb protein, fat, carbohydrates, as well as water, vitamins, and minerals.

Many people who experience Crohn's disease flare ups find that soft, bland foods cause less discomfort than spicy or high-fiber foods. While your diet can remain flexible and should include a variety of foods from all food groups, your doctor will likely recommend restricting your intake of dairy if you are found to be lactose-intolerant."

References:

1. https://www.crohnscolitisfoundation.org/What-is-crohns-disease/treatment