Different Countries' Food and Ulcerative Colitis

As you know, food plays a crucial role in any illness. Ulcerative colitis is more common in Europe and North America. Is it related to the food in these regions? Why is it that China, India, and Africa have fewer patients of ulcerative colitis

Did anyone try to change their diet from the European Diet to another diet ?

https://pubmed.ncbi.nlm.nih.gov/29050646/#:~:text=The%20highest%20reported%20prevalence%20values,per%20100%20000%20in%20Canada).