A person with ulcerative colitis reported no gastrointestinal symptoms while following a 10-hour fast, 14-hour eating schedule for eight weeks, and symptoms remained controlled as long as they continued this eating pattern, even though their medication did not change.

In one person with ulcerative colitis in remission, following a 10/14 intermittent fasting schedule for eight weeks did not cause harmful changes in liver function, blood fats, or thyroid hormone levels, even though markers of inflammation decreased.

In one person with ulcerative colitis, following a 10-hour eating window and 14-hour fasting period for eight weeks was linked to a small rise in hematocrit and white blood cell count, while hemoglobin and platelet levels remained unchanged.

In a woman with ulcerative colitis in remission, following a 10-hour eating window and 14-hour fast for eight weeks was linked to lower levels of two inflammation markers in blood and stool, as well as improved symptoms, without affecting lipid, liver, or thyroid blood tests.

People with ulcerative colitis who have elevated levels of fecal calprotectin before Ramadan fasting are more likely to experience a worsening of their symptoms during the fasting period.

During Ramadan fasting, people with ulcerative colitis may experience worsening symptoms, while those with Crohn’s disease typically do not show a change in symptoms, suggesting that fasting affects these two conditions differently.