Op Ed: A 5-day modified diet significantly decreased endoscopic and subjective disease activity.

Background & Rationale

Crohn’s disease is a chronic inflammatory condition of the gastrointestinal tract characterised by periods of remission and relapse. Current pharmacological therapies, while effective for many, do not consistently achieve sustained remission and are often associated with adverse effects. Increasing interest exists in the potential of dietary interventions to modulate disease activity, reflecting the known interplay between gut microbiota, intestinal inflammation, and dietary components. This study examined the effect of a short-term, intensive dietary intervention on subjective and objective markers of disease activity in patients with moderate to severe Crohn’s disease. The rationale for the design centred on reducing luminal content and associated inflammation via a simplified, easily digestible diet.

Study Design

This randomised, parallel-group, controlled clinical trial assessed patients with Crohn’s disease experiencing a clinical relapse. Participants were randomised in a 2:1 ratio to receive either a 5-day modified diet or continued habitual diet. The primary endpoint was the change from baseline in the Simple Clinical Crohn’s Disease Activity Index (SCCDAI) score at day 5. Secondary endpoints included endoscopic assessment—specifically, the Crohn’s Disease Endoscopic Index of Severity (CDEIS) – at day 5, as well as faecal calprotectin levels, quality of life assessed via the Inflammatory Bowel Disease Questionnaire (IBDQ), and nutritional parameters. Assessments were conducted at baseline and after 5 days of intervention.

Patient Population

The study enrolled 94 patients with Crohn’s disease confirmed by endoscopy and histology. Inclusion criteria included a diagnosis of Crohn’s disease according to established criteria, age between 18 and 75 years, a current flare, and an SCCDAI score of 4-10. Exclusion criteria included the presence of strictures prohibiting endoscopic access, active infection, significant comorbidities, prior bowel resection in the preceding 3 months, and pregnancy or breastfeeding. Sixty-three patients were randomised to the dietary intervention group, and 31 remained in the control group receiving habitual diet.

Key Findings

At day 5, patients receiving the dietary intervention demonstrated a mean reduction in SCCDAI scores of 3.1 points from baseline. Conversely, the control group showed a mean reduction of 0.3 points. The CDEIS score decreased by an average of 2.1 points in the dietary intervention group, compared to a decrease of 0.1 points in the control group. Faecal calprotectin levels declined from a mean of 290 µg/g to 130 µg/g in the intervention group, while remaining stable at a mean of 280 µg/g in the control group. IBDQ scores improved by an average of 18 points in the dietary intervention group, compared to 2 points in the control group. Weight loss was observed in the intervention group, with an average reduction of 1.1 kg over 5 days, while the control group showed negligible weight change.

Discussion

These findings suggest that a short-term, intensive dietary intervention can rapidly improve both subjective and objective markers of disease activity in patients experiencing a Crohn’s disease flare. The observed improvements in SCCDAI, CDEIS, faecal calprotectin and IBDQ scores indicate a broad impact on disease parameters. The dietary protocol, designed to minimise gut luminal content, is posited to reduce inflammation and allow for mucosal healing. The observed weight loss was modest and likely attributable to reduced caloric intake through the restricted diet. The study did not report any serious adverse events directly linked to the dietary intervention; however, it acknowledges that palatability may present a challenge for some patients.

Authors’ Conclusions

The authors conclude that a 5-day modified diet is a feasible and effective intervention for rapidly reducing disease activity in Crohn’s disease, demonstrated by significant improvements in clinical, endoscopic, and biochemical parameters. They propose that this approach may represent a valuable adjunct to standard pharmacological treatment strategies, particularly during acute flares. Further research is warranted to examine the long-term efficacy and durability of this intervention, as well as to identify the optimal dietary composition for individual patients.

Reference

Turner, D., et al. (2023). Rapid dietary intervention improves symptomatic Crohn’s disease: a randomised controlled trial. The Lancet Gastroenterology & Hepatology, 9(8), 663–672. https://doi.org/10.1016/S2468-1253(23)00178-1