Ulcerative Colitis

Definition

Chronic inflammatory bowel disease limited to colon and rectum with mucosal and submucosal inflammation, causing bloody diarrhea and abdominal pain.

How it works

Ulcerative colitis involves dysregulated mucosal immunity causing continuous inflammation limited to colon and rectum. The disease starts rectally and extends proximally in continuous pattern, typically sparing small intestine. Acute flares cause bloody diarrhea, abdominal cramps, urgency, tenesmus, and systemic symptoms including fever and malaise. Chronic disease increases colorectal cancer risk and causes nutritional deficiencies from malabsorption and blood losses. Triggers include increased intestinal permeability, dysbiosis, and dietary factors. Nutritional management emphasizes adequate calories, protein, and micronutrients. Low-residue diet during flares, increased fiber during remission, and avoidance of individual triggers improve symptoms.

Role

Indicates mucosal colonic inflammation requiring tailored dietary management to minimize disease flares and maintain nutritional adequacy.

Examples

• High refined sugar consumption
• Insufficient fiber intake
• Dysbiosis from antibiotic exposure
• Dairy products in lactose-intolerant individuals

Recommendations

During flares, adopt low-residue diet limiting raw vegetables and whole grains while ensuring adequate protein and calories. During remission, gradually increase soluble fiber and introduce whole grains. Identify individual trigger foods through elimination diet and maintain adequate hydration and micronutrient intake.

Key takeaway

Ulcerative colitis management requires disease-activity-based dietary modification combined with micronutrient optimization to maintain quality of life and nutritional status.

Related terms