Background: Overnutrition and undernutrition can affect patients with inflammatory bowel disease (IBD). Although all IBD outpatients should be screened for nutrition risk, screening is not routinely performed, potentially leading to reduced identification and treatment. This study aimed to estimate the prevalence of nutrition risk in adult IBD outpatients and the proportion of cases who discussed diet and/or nutrition during their routine clinical appointment. Methods: Adults with IBD attending outpatient clinics at 4 hospitals in Greece and in UK were recruited. Demographic and anthropometric data were collected using face-to-face patient interviews and clinical records. Patients were classified as high (i.e., body mass index [BMI] < 18.5 or 18.5–20 kg/m² and weight loss > 5%), moderate (i.e., BMI 20–25 kg/m² and weight loss > 5%) or low risk of undernutrition and high risk of obesity (i.e., BMI 25–30% and weight gain > 5%). The proportion of patients who discussed diet and/or nutrition during their clinical appointment was calculated. Results: In total, 390 IBD patients participated. Sixteen (4%) patients were underweight, 113 (29%) were overweight and 71 (18%) were obese. Twenty-one (5%) patients were at high risk of undernutrition; of these 4 (19%) were under dietetic care. Of those at high risk of undernutrition, 11 (52%) had discussed diet and/or nutrition during their routine clinical appointment. Fifty-six (14%) patients had gained more than 5% weight since their last recorded/reported weight and 19 (5%) were at high risk of obesity. Conclusions: Few patients were identified to be at high risk of undernutrition and less than a fifth of these were under dietetic care. Overnutrition is a growing problem in IBD with almost half of adult patients being overweight or obese. Diet and/or nutrition were not routinely discussed in this group of IBD outpatients.

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