Background: The association between beverage intake and ulcerative colitis (UC) is not well-established, with no available data from Arab countries. Herein, we investigated the potential association of consuming coffee, tea, and carbonated soft drinks with UC among a population from Saudi Arabia. Methods: This hospital-based case-control study used data of 171 newly diagnosed UC patients and 400 patients with other gastrointestinal conditions who served as controls. All UC cases were ascertained by endoscopy, while beverage intake was assessed by a questionnaire that was completed before diagnosis. We computed odds ratios (ORs) and 95% confidence intervals (95% CIs) of UC and UC extension for frequent versus infrequent intakes of coffee, tea, and carbonated soft drinks using logistic regression. Results: Overall, 23.4% of UC patients had pancolitis, 21.1% extensive, 51.4% left-sided, and 4.1% proctitis. UC patients had a similar sex distribution to the controls but were older and had a lower BMI. After adjustment for age, sex, body mass index, and smoking history, frequent intakes of coffee and tea were associated with lower odds of UC: 0.62 (0.42, 0.91) and 0.53 (0.35, 0.79), respectively. On the other hand, frequent intakes of carbonated soft drinks were associated with increased odds of UC: 9.82 (6.12, 15.76). The frequency of beverage consumption was not associated with UC extension. Conclusion: UC was negatively associated with frequent coffee and tea consumption but positively associated with frequent carbonated soft drink intake in Saudi people. More population-based prospective cohort studies are needed to confirm our findings.

Background: Inflammatory bowel diseases (IBD), including ulcerative colitis (UC) and Crohn’s disease (CD), are chronic conditions with complex etiologies that may involve dietary factors. This study investigates the association between fruit and vegetable consumption and the risk of UC and CD, focusing on gender-specific differences. Methods: A hospital-based case–control study, comprising 158 UC patients (93 men and 65 women), 245 CD patients (167 men and 78 women), and 395 controls without IBD (256 men and 139 women), was conducted in Riyadh, Saudi Arabia. Fruit and vegetable consumption data were gathered through a self-administered questionnaire distributed before diagnosis. Logistic regression analysis was applied to estimate the odds ratios (ORs) and 95% confidence intervals (95% CIs) for UC and CD among the participants reporting the daily consumption of fruits and vegetables. Results: Among men, daily vegetable consumption was associated with higher odds of UC in the age-adjusted model [OR (95% CI): 1.78 (1.02, 3.10)], but this association became non-significant after further adjustment for body mass index, smoking, anemia, and elevated liver enzymes [OR (95% CI): 1.70 (0.91, 3.18)]. No significant associations were observed between vegetable consumption and CD. In contrast, the women who consumed vegetables every day had a non-significant inverse association with UC and a significant inverse association with CD in both the age-adjusted and multivariable-adjusted models [ORs (95% CIs): 0.44 (0.23, 0.87) and 0.41 (0.20, 0.84), respectively]. Fruit consumption was neither associated with UC nor CD in either sex. Conclusions: Daily vegetable consumption was significantly associated with decreased odds of CD among women, but not men, highlighting potential sex-specific dietary influences on IBD risk.