Objectives: To determine if a 12-week IF intervention compared to SM:
1. Induces weight loss of at least 1 BMI unit.
2. Reduces intestinal and systemic inflammation.
3. Alters gut microbial community structure (beta-diversity) from baseline.
4. Alters the adipokines and myokines leptin, adiponectin, IL-6, or irisin.
5. Alters zonulin and serum levels of gastrointestinal hormones ghrehlin, glucagon-like peptide 1 (GLP-1), and glucagon-like peptide 2 (GLP-2).
6. Alters body composition and whether changes in body composition have an effect on biomarkers of inflammation.
7. Is a feasible and sustainable intervention for patients with CD.
Hypotheses: We hypothesize that, compared to SM, IF will:
1. Induce at least a 1-unit decrease in BMI over the course of the intervention.
2. Improve inflammatory markers of CD, demonstrated by a decrease in FCP by ≥ 50%, normalization of FCP to ≤ 100 µg/g, or a decrease in CRP to ≤ 5 mg/L.
3. Alter gut microbial community structure (beta-diversity ) and lead to enrichment of bacterial species typically depleted in CD, such as Faecalibacterium prausnitzii and Roseburia hominus with concomitant decreases in Escherichia coli and overall Proteobacteria phylum abundance.
4. Alter adipokines and myokines (leptin, adiponectin, IL-6, and irisin), zonulin and serum levels of gastrointestinal hormones (ghrehlin, GLP-1, and GLP-2).
5. Alter body composition by decreasing VAT.
6. Be a feasible and sustainable treatment option for patients with CD
Methods
Study Design:
The study is a 12-week pilot randomized controlled trial (RCT). Eligible participants (N=42) will be randomized 1:1 to either the IF or the SM control group. Patients from the University of Calgary IBD clinic will be enrolled in the RCT.
Screening:
The study RD will assess participants for malnutrition using the abridged patient-generated subjective global assessment (PG-SGA), a validated tool to determine malnutrition status in patients with chronic disease. The Nine Item Avoidant/Restrictive Food Intake Disorder screen33 will be completed to rule out avoidant and restrictive food behaviours that may increase the malnutrition risk of an IF intervention.
Inclusion criteria:
1\) ≥ 18 to ≤ 75 years of age; 2) ileocolonic or colonic CD in clinical remission diagnosed through conventional definitions with a Harvey Bradshaw Index (HBI) \< 5 within 3 months of recruitment; 3) presence of inflammation using an FCP ≥ 250 µg/g or a CRP ≥ 5 mg/L; 4) stable dosing of biologic agents and/or immunomodulators and/or oral or rectal 5-ASA, and no changes to medical management (including corticosteroid exposure) for at least 3 months prior to recruitment; and 5) presence of overweight or obesity with BMI \> 25 and a PG-SGA of class A.
Exclusion criteria:
1\) upper gastrointestinal involvement CD, fistulizing disease; 2) documented strictures based on sonographic findings or colonoscopy within the last year; 3) \> 1 small bowel resection; 4) colectomy; 5) presence of an ostomy; 6) antibiotic use in past 3-months; 7) pregnancy; and 8) corticosteroids in the last 3 months.
