The ADDapt Diet in Reducing Crohn's Disease Inflammation

Crohn Disease Clinical Trial

Official title:

The ADDapt Diet in Reducing Crohn's Disease Inflammation

Clinical Trial Details — Status: Recruiting

Administrative data

• NCT number: NCT04046913
• Other study ID #: IRAS 260196
• Status: Recruiting
• Phase: N/A
• Start date: September 9, 2019
• Est. completion date: August 25, 2024

Study information

• Verified date: January 2024
• Source: King's College London
• Contact: Aaron Bancil, MBBS
• Phone: 02078484552
• Email: aaron.bancil[@]kcl.ac.uk
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial Summary

Crohn's disease (CD) results in chronic intestinal inflammation, is of increasing incidence both in the developed and developing world and has a marked impact on patient quality of life. The prevalence of CD is 10.6 per 100,000 people in the UK and represents a significant annual financial burden of around €16.7 billion in Europe. A wide range of nutrients and food components have been investigated for their role in the pathogenesis and course of CD. A common theme suggests that CD risk is associated with a "Western diet", including high fat, high sugar and processed foods. However, intervention studies that exclude specific aspects of the diet such as sugar or that compare low and high fat diets have failed to show effectiveness in practice. Observational human and experimental animal studies suggest that certain food additives used extensively by the food industry play a role in the pathogenesis and natural history of CD. However, to date no evidence exists for the effectiveness of a diet low in these food additives in CD. Therefore, the aim of this study is to investigate the effects of a diet low in certain food additives compared to a normal UK diet on CD activity, health-related quality of life, gut bacteria, gut permeability, gut inflammation and dietary intake, in patients with mildly active, stable CD. We will recruit patients with mildly active CD and will randomise them to receive either the diet low in the food additives of interest, or the diet representative of a normal UK diet. Patients will follow their allocation diet for 8 weeks and will attend study visits at the start and end of the trial, at which points questionnaires will be completed and samples will be collected. Crohn's disease (CD) results in chronic intestinal inflammation, is of increasing incidence both in the developed and developing world and has a marked impact on patient quality of life. The prevalence of CD is 10.6 per 100,000 people in the UK and represents a significant annual financial burden of around €16.7 million in Europe. A wide range of nutrients and food components have been investigated for their role in the pathogenesis and course of CD. A common theme suggests that CD risk is associated with a "Western diet", including high fat, high sugar and processed foods. However, intervention studies that exclude specific aspects of the diet such as sugar or that compare low and high fat diets have failed to show effectiveness in practice. Observational human and experimental animal studies suggest that certain food additives used extensively by the food industry play a role in the pathogenesis and natural history of CD. However, to date no evidence exists for the effectiveness of a diet low in these food additives in CD. Therefore, the aim of this study is to investigate the effects of a diet low in certain food additives compared to a normal UK diet on CD activity, health-related quality of life, gut bacteria, gut permeability, gut inflammation and dietary intake, in patients with mildly active, stable CD. We will recruit patients with mildly active CD and will randomise them to receive either the diet low in the food additives of interest, or the diet representative of a normal UK diet. Patients will follow the diet for 8 weeks and will attend study visits at the start and end of the trial, at which points questionnaires will be completed and samples will be collected.

Recruitment information / eligibility

• Status: Recruiting
• Enrollment: 154
• Est. completion date: August 25, 2024
• Est. primary completion date: April 25, 2024
• Accepts healthy volunteers: No
• Gender: All
• Age group: 16 Years and older

Eligibility

Inclusion Criteria:

• Adults aged =16 years
• CD diagnosis (defined by standard clinical, histological and radiological criteria) of at least 3 months
• Mildly active disease as defined by:
• Defined by physician assessment that no change in medication is required
• Faecal calprotectin >150 µg/g
• CDAI between 150-250
• Current body weight of =50 kg
• Individuals able to give informed consent and willingness to participate

Exclusion Criteria:

• Changes in dose to azathioprine, 6-mercaptopurine, methotrexate or anti-TNF-a agents or other biologics during the preceding 8 weeks, oral 5-ASA during the preceding four weeks. Currently receiving oral prednisolone/budesonide or discontinued within the last 4 weeks, unless they are on a stable dose of 10 mg/day or less prednisolone (3 mg or less budesonide) for at least 4 weeks with the intention to continue this long term.
• Used rectal 5-ASA or rectal steroids in the preceding 4 weeks
• Previous extensive bowel resection, defined as having had >2 intestinal resections, a sub-total colectomy or documented short bowel syndrome
• Poorly controlled bile acid malabsorption
• Current stoma
• Recent use of the following treatments: antibiotics, probiotics, prebiotic or fibre supplements in the preceding four weeks, NSAIDs during the preceding week
• Full bowel preparation for a diagnostic procedure in preceding 4 weeks
• Comorbidities including sepsis/fever, diabetes or coeliac disease, or other concomitant serious comorbidity e.g. significant psychiatric, hepatic, renal, endocrine, respiratory, neurological or cardiovascular disease
• Exclusive enteral nutrition in the past 8 weeks
• Assessed as at nutritional risk, as defined by any of the following:
• BMI =18.5 kg/m2
• Previous or current eating disorder
• Currently receiving prescribed oral nutritional supplements
• Following a restrictive diet (e.g. multiple restrictions due to numerous self-reported allergies) as judged by the dietitian
• Reported pregnancy or lactation

Related Conditions & MeSH terms

• Crohn Disease
• Inflammation
• Inflammatory Bowel Diseases

Intervention

Behavioral:
• Dietary education
Intervention: Low food additive diet. Control: Habitual food additive diet

Locations

Country	Name	City	State
United Kingdom	King's College London	London

Sponsors (1)

Lead Sponsor	Collaborator
King's College London

Country where clinical trial is conducted

United Kingdom, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Crohn's Disease Activity Index	The proportion of patients achieving at least a 70-point reduction in the Crohn's Disease Activity Index from baseline to week 8	Difference between baseline and week 8
Secondary	Faecal calprotectin	The proportion of patients achieving at least a 50% reduction in faecal calprotectin concentration.	Baseline, 8 weeks and 26 weeks
Secondary	Faecal calprotectin	Absolute faecal calprotectin concentrations during the trial.	Baseline, 8 weeks and 26 weeks
Secondary	Faecal calprotectin	Proportion of patients achieving faecal calprotectin concentrations <150 µg/g.	Baseline, 8 weeks and 26 weeks
Secondary	Serum C-reactive protein	Absolute CRP concentration an proportion of patients achieving a CRP concentration <5 mg/L	Baseline, 8 weeks and 26 weeks
Secondary	Mucosal immune cell gene expression	RNA sequencing on GI immune cells isolated from rectal biopsies	Baseline and 8 weeks
Secondary	Crohn's Disease Activity Index (CDAI)	Change in CDAI score during the trial.	Baseline, 8 weeks and 26 weeks
Secondary	Crohn's Disease Activity Index (CDAI)	Proportion of patients achieving a CDAI score <150 points (clinical remission) by 8 weeks.	Baseline and 8 weeks
Secondary	Crohn's Disease Activity Index (CDAI)	Proportion of patients achieving =100-point reduction in CDAI score by 8 weeks.	Baseline and 8 weeks
Secondary	Perceived Crohn's disease control	Absolute score in IBD-control questionnaire	Baseline, 8 weeks and 26 weeks
Secondary	Health related quality of life	Inflammatory Bowel Disease questionnaire, IBDQ	Baseline, 8 weeks and 26 weeks
Secondary	Faecal microbiota composition	16S sequencing	Baseline, 8 weeks and 26 weeks
Secondary	Faecal microbial gene expression	16S RNA sequencing	Baseline, 8 weeks and 26 weeks (in a subset of participants)
Secondary	Mucosal microbiota composition	16S sequencing	Baseline and 8 weeks (in a subset of participants)
Secondary	Gastrointestinal permeability	Sugar probe solution urinary analysis to determine intestinal permeability	Baseline and 8 weeks
Secondary	Dietary intake	Micronutrient and macronutrient intake	Baseline, 8 weeks and 26 weeks
Secondary	Dietary adherence	Reduction in intake of food additives	Baseline, 8 weeks and 26 weeks
Secondary	Diet feasibility and acceptability	Acceptability questionnaire, including food-related quality of life	Baseline, 8 weeks and 26 weeks