Does diet have an effect on IBD: Crohn's disease and Ulcerative colitis?

In 2015, Jeroen le Duc was diagnosed with Crohn's disease. According to the internist, nutrition has no effect on the course of the disease. The opposite appears to be true. The food you choose has a huge effect on your health. Together with the restoration of your digestion, you can completely recover this so-called incurable diseases.
What do you think, does nutrition have an effect on your health?