Ulcerative colitis (UC) is a form of inflammatory bowel disease. Multiple disease relapses can impair the quality of life in UC patients and increase the risk of colitis-associated complications. Diet is known to play an important role in the complex pathogenesis of UC and many patients attribute their disease relapses to diet. This is an interesting work aimed to study the demographic and dietary profile of UC patients, assess their beliefs regarding the effect of nutrition on disease conditions, and study the effect of diet on disease severity. A crosssectional study was conducted at Al-Rajhi University Hospital, Assiut and included 70 patients diagnosed with UC. The mean age of studied patients was 35.63 ± 9.92 years and more than half of them were females. As regards socioeconomic level, 55.7% of patients were from the middle level, and 42.9% of patients were from the low socioeconomic level. The most frequently consumed food items were beans and cereals while meat, sea food and eggs were the least frequent. The majority of patients believed that nutrition was an important cause of the disease. There was a significant association between the fiber content of diet and disease severity. In conclusion, different dietary contents have a great effect on patients with UC. Patients consuming high fiber diets were found to have better disease outcomes with low disease severity. More than half of patients with high- fiber diet had mild disease and received conventional therapy