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A Simple Dietary Questionnaire Correlates With Formal Dietitian Evaluation and Frequently Identifies Specific Clinical Interventions in an Outpatient Gastroenterology Clinic

Background: The spectrum of gastroenterology-related diseases related to obesity is growing. Few clinical tools exist to aid in clinician-guided dietary counseling. Goals: (1) Develop and validate a 1-page diet history form that would provide information on dietary factors that can contribute to gastrointestinal (GI) illness and to assess adherence to the Mediterranean diet; and (2) evaluate the form in a general GI clinic to determine its potential utility as a clinical tool. Study: A 1-page diet history form was developed and underwent qualitative and quantitative validation in comparison to a formal diet evaluation by a registered dietitian. The form was then evaluated in consecutive patients attending a general GI clinic, and analyzed for overall diet content, compliance with a Mediterranean diet, and presence of high-risk (red flag) dietary behaviors. Results: The form was evaluated in 134 patients. In a validation cohort (n=30) the qualitative dietary components measured were highly concordant with a formal dietary interview. Total daily calorie intake correlated with formal dietary review (R=0.61), but tended to underestimate total calories due to less precision in portion size. The prospective cohort (n=104) patients had a mean body mass index of 29.8. Overall, 52.9% were obese, 50% had metabolic syndrome, and 51% had a primary GI illness directly impacted by dietary factors (gastroesophageal reflux, irritable bowel, fatty liver). Overall, 85.6% of patients documented red flag behaviors. Patients with obesity trended for more red flags than overweight or normal body mass index groups. Conclusion: A 1-page diet questionnaire correlated well with formal dietary assessment and identified clinically relevant dietary interventions in a high percentage of GI patients.