Bowel preparation before colonoscopy may temporarily disrupt the gut’s protective balance, according to new preclinical research. The study suggests that commonly used laxative regimens can weaken natural defenses in the digestive tract, potentially increasing vulnerability to inflammation and infection for a short period.
In mouse models, simulated bowel preparation caused diarrhea that stripped away protective mucus, reduced beneficial bacteria, and lowered levels of compounds that help control inflammation. During this window, harmful bacteria were more likely to grow and spread beyond the gut. Animals exposed to inflammatory conditions showed signs of worsened disease activity after the procedure compared with controls.
Researchers stress that colonoscopies remain an essential tool for detecting and treating digestive disease. The findings instead highlight a need to better understand how bowel preparation affects vulnerable patients, particularly those with chronic gut conditions, and to explore ways to make the process safer without compromising the effectiveness of the exam.
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