Inflammatory bowel diseases are chronic inflammatory diseases of the digestive system which include three key pathologies: ulcerative colitis (UC), Crohn's disease (CB) and microscopic colitis. In addition to medical and surgical treatment, nutrition plays an important role as supportive therapy in achieving and maintaining remission and improving the quality of life of patients. The aim of this research was to investigate the eating habits and frequency of elimination of certain food groups in patients with inflammatory bowel diseases. 173 respondents participated in the research, whose data were collected using a questionnaire. According to the obtained results, the appearance of the disease probably prompted ill people to change their own diet: more than half of the respondents (54.3 %) significantly changed their diet after the diagnosis of inflammatory bowel disease. The change in diet was significantly more prevalent in women compared to men. It was found that respondents do not follow the recommendations about more frequent and smaller meals throughout the day. They don't have the habit of eating fruits and vegetables and consume meat more often than fish and seafood. Respondents less often exclude foods from the group of cereals and cereal products from the diet, while foods from the group of milk and milk products are eliminated more often, especially milk, which excludes half of the respondents from the diet.