Can Intermittent Fasting Induce Weight Loss and Improve Gut Health as Compared to Standard Medical Care in Patients With Obesity/High BMI and Crohn's Disease. (CD-Fast)

University of Calgary

Status: Not yet enrolling

Conditions: Crohn Disease

Treatments: Other: Intermittent Fasting

Study type: Interventional

Funder types: Other

Identifiers

NCT05230160

REB21-1539

Details and patient eligibility

About

Diet is a determinant of gut microbial diversity and composition and is recognized as a potential environmental trigger for IBD; for example, high-fat diets are associated with increased risk of CD in pre-clinical models, with effects mediated through dysbiosis and altered gut permeability.

Diet is also a potential non-pharmacological therapy for weight loss and for reducing the occurrence of disease flares and the reliance on dose escalation of biologic agents. Indeed, there is accumulating evidence for the role of diet in the treatment of CD, and diet-induced improvement of microbial dysbiosis is associated with induction of remission in pediatric patients with active CD.

Intermittent Fasting (IF) is a dietary intervention that involves periodic intervals of no or very limited energy intake. We want to determine the efficacy and feasibility of a 12-week IF(Intermittent Fasting) intervention to induce weight loss (by 1 BMI unit reduction), decrease biomarker inflammation and increase microbial functional diversity compared to standard medical management (SM) in a pilot study of individuals with overweight or obesity and CD in clinical remission with elevated biomarkers of inflammation, indicated by fecal calprotectin (FCP) > 250 µg/g or C-reactive protein (CRP) > 5 mg/L).

Full description

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.

Enrollment: 42 estimated patients

Sex: All

Ages: 18 to 75 years old

Volunteers: No Healthy Volunteers

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
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;
8. corticosteroids in the last 3 months.

Trial design

Primary purpose: Other

Allocation: Randomized

Interventional model: Parallel Assignment

Masking: None (Open label)

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42 participants in 2 patient groups

Intervention Group

Experimental group

Description:

The IF group will fast for 16 consecutive hours on 6 days per week with an 8-hour eating window (e.g., eat from 10 a.m. to 6 p.m.). The IF group will consume their habitual diet in terms of food choices and energy intake, but only during the 8-hour and full-day non-fasting periods. An RD will meet virtually with participants in the IF group at baseline to teach them the fasting protocol and how to manage energy intake and hunger, as well as to reinforce the requirement to not change habitual dietary practices. The research coordinator will call patients every two weeks to assess for changes in medications, compliance with the fasting protocol, and symptoms (assessed monthly) using the modified HBI.

Treatment:

Other: Intermittent Fasting

Standard Medical Care Group

No Intervention group

Description:

The control group will continue with their habitual dietary pattern. The research coordinator will call patients at baseline and every two weeks to assess for changes in medications and symptoms (assessed monthly) using the modified HBI.