You have Crohn's because you keep ingesting inflammatory foods.
1) Vegetable oils contain inflammatory compounds known as peroxides, lipid peroxides, and aldehydes.
2) Other foods containing the toxic frankensteined vegetable oils.
You can eat whatever you'd like however please don't throw the baby out with the bath water and not consume plants at all.
There is plenty of healthy anti-inflammatory plants and those that I love consuming are peas(Vitamin K), sunflower seeds (except those from Asia), non-rancid walnuts, tender leafy greens(Vitamin A/K/Minerals) without condiments and chewed very well, hemp seeds, steaming vegetables at the lowest temperature for extended amount of time and freshly squeezed carrot juice. The carrot juice is hands down the most anti-inflammatory food I've ever consumed.
I just hope that you're consuming animal products from non-abused animals.