Disordered eating in gastroenterology has been a recent concern due to high prevalence rates reported based on screening tools(1). Dietary therapies are the preferred treatment modality to manage symptoms in irritable bowel syndrome (IBS). However, diets such as the low fermentable carbohydrate (FODMAP) diet are restrictive, and concerns exist regarding adverse nutritional and psychological risks, including disordered eating. While screening questionnaires are recommended for clinical use, they have not been validated in gastroenterology-specific populations and hence may overestimate prevalence, particularly in the setting of dietary management(2). This study aimed to i) prospectively evaluate for disordered eating pre- and post- dietary FODMAP education, and ii) understand if validated questionnaires are appropriate to screen for disordered eating in IBS. This pilot prospective study recruited diet-naïve participants with IBS (Rome IV). At baseline, participants completed a 3-day food diary, the IBS-symptom severity scale (IBS-SSS), and disordered eating screening questionnaires (Nine Item avoidant/restrictive food intake disorder (ARFID) screen (NIAS), and the Sick Control One Fat Food (SCOFF)). After completing the conventional disordered eating screening questionnaires, participants were provided the questions again and asked to answer excluding the impact of their gastrointestinal condition (alternate version). Additionally, a gold-standard clinical assessment for disordered eating was undertaken by a provisional psychologist. Participants were excluded if they were identified as having disordered eating at baseline. A dietitian then provided low FODMAP dietary education to be followed for 6-weeks. At 6-weeks, participants repeated the same measures and saw the dietitian for FODMAP re-challenge education. A series of paired t-test were used. Of the 35 participants (33 female, mean age 42 (21-76)) who completed the baseline screening, one participant was excluded due to identification of disordered eating (3%). Total IBS-SSS reduced from 298±92 at baseline to 149±73 at 6-weeks (p<0.001). Of the 25 participants who completed the 6-week intervention, none had disordered eating based on clinical assessment. Using the conventional tool, the SCOFF reduced from 0.91±1.03 at baseline to 0.80±1.01 at 6-weeks (p=0.70), with SCOFF ≥2 (indicating disordered eating risk) met by 15% at both baseline (5/34) and 6-weeks (3/20). Using the alternate SCOFF tool, the SCOFF reduced from 0.62±1.04 at baseline to 0.30±0.73 at 6-weeks (p=0.18), with 15% and 5% meeting the ≥2 cut-off. The mean NIAS score was 9.62±9.55 at baseline, and 13.15±7.42 at 6-weeks (p=0.16), with 8% and 10% meeting the cut-off of 24 indicating ARFID. Using the alternate NIAS, the mean score was 5.21±8.86 at baseline and 5.65±6.04 at 6-weeks with the alternate version (p=0.84), with 3% and 0% meeting the cut-off for ARFID. In conclusion, based on clinical assessment, dietary intervention when educated by a dietitian does not cause disordered eating. However, recommended screening tools may overestimate disordered eating in gastrointestinal populations.