The effect of eating lunch before an afternoon colonoscopy.

Background/aims: Traditionally, patients fast from midnight the night before to just prior to the colonoscopy. Many patients find it extremely inconvenient to have to fast for a full day. We sought to compare: a group in which diet was restricted and a group in which diet was not restricted.

Methodology: Patients who attended inpatient clinics of Hanyang University Hospital who were scheduled to undergo colonoscopy were considered eligible to participate in this study. The subjects were randomly assigned to either eat lunch before colonoscopy or to fast before the colonoscopy.

Results: There were no significant differences between the study groups with respect to age, gender distribution, previous abdominal surgery, or bowel movements. The two groups showed no significant differences in bowel cleanliness scores or fluid volume scores. Patients' unwillingness to undergo the same procedure in the future was 10.0% in group A compared to 33.3% in group B. With regard to the patients' opinion about lunch before colonoscopy, most of the subjects in group A answered that they would eat lunch before colonoscopy again if given the choice.

Conclusions: Eating lunch before afternoon colonoscopy had no negative impact on the quality of the bowel preparation.