Introduction: Many patients with chronic constipation attribute their symptoms to dietary factors, and restrictive eating is a common phenomenon in patients in this population. We aimed to determine which clinical factors affected restricted eating in these patients. Methods: We enrolled consecutive patients referred to our center for anorectal manometry in the setting of chronic constipation. Patients completed a validated disease-specific quality of life questionnaire (CR-QOL), which included an Eating Subscale where higher scores reflect more restricted eating. Patients also completed a symptom severity questionnaire (PAC-SYM) with subscales corresponding to abdominal symptoms (pain, discomfort, and bloating), rectal symptoms, and stool symptoms, the Hospital Anxiety and Depression Score inventory (HADS), a Rome III constipation module, and the Patient Health Questionnaire 15 (PHQ-15), a measure of somatization. Additionally, patients were asked which symptom was most bothersome about their constipation: painful bowel movements, infrequent bowel movements, straining, incomplete bowel movements, and bloating/fullness. Multivariable linear regression adjusting for confounders defined independent effect of measures of constipation severity, comorbidities, and demographics on eating patterns. Results: We enrolled 115 patients (101 females) with a mean age of 47.9 years referred for evaluation of chronic constipation. On univariate analysis, overall symptom severity from the PAC-SYM (R=0.22, P=0.03), as well as the abdominal symptom subscale (R=0.31, P=0.001) correlated with restricted eating. There was no association between rectal symptoms and stool symptoms and restricted eating. Additionally, somatization (P=0.007), anxiety (P=0.02), and depression (P=0.004) all had mild correlation to restricted eating (all Rs< 0.3). After multivariate adjustment, only abdominal symptoms remained an independent predictor of restricted eating (P=0.02). Patients complaining of bloating as their primary complaint had a mean Eating Subscale score of 10.4±3.7 compared to 8.5±3.4 for those with a primary complaint of straining, incomplete evacuation, infrequentBMs, or painful BMs (P=0.01). Conclusion: Among patients presenting for evaluation of chronic constipation, abdominal symptoms (including bloating) were the primary driver of restricted eating patterns. These patients may derive the greatest benefit from structured, evidence-based dietary interventions rather than self-imposed restrictions.
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