The Feasibility of Following the Crohn's Diet

• Acceptability of following the Crohn's Diet: questionnaire[ Time Frame: Throughout the 14-day intervention and within one week of completing the intervention ]
  Method: Administer questionnaires on diet acceptability, including the Food-Related Quality of Life in Inflammatory Bowel Disease questionnaire (Hughes et al 2016).
• Participant compliance to the Crohn's Diet[ Time Frame: Throughout the 14-day intervention ]
  Method: Dietitian monitoring of compliance during the trial. A 7-day food diary will quantify compliance alongside a questionnaire which explores reasons for potential non-compliance.
• Impact of the Crohn's Diet on habitual dietary intake[ Time Frame: One week before the intervention and throughout the 14-day intervention ]
  Method: 7-day food diaries to compare nutrient intake and explore changes in dietary patterns.
• Impact of the Crohn's Diet on BMI[ Time Frame: One week before the intervention and within one week of completing the 14-day intervention ]
  Method: Participants will undergo anthropometric assessment, including weight and height to report BMI.
• Impact of the Crohn's Diet on gastrointestinal symptoms[ Time Frame: One week before the intervention and within one week of completing the 14-day intervention ]
  Method: Administer the PRO-2 questionnaire (Khanna et al 2015).
• Impact of the Crohn's Diet on perceived disease control[ Time Frame: One week before the intervention and within one week of completing the 14-day intervention ]
  Method: Administer questionnaires, including the Inflammatory Bowel Disease Control-8 questionnaire (IBD-C-8) (Bodger et al. 2013).

A research team from King's College London are investigating how diet can be used as a treatment for Crohn's disease. The investigators have designed a new diet and eventually wish to test whether the diet can be used to manage Crohn's disease and reduce gut inflammation. Before doing this, the investigators need to find out how practical it is for people to follow the diet for 14 days by conducting this 'feasibility' study. A feasibility study is a small study that aims to highlight any issues before informing the design of a larger research trial. The diet the investigators have designed is called the Crohn's Diet. The evidence for this diet is based on recent research which suggests that certain food ingredients may be involved in triggering gut inflammation. The study's primary aim is to assess the practicalities of following the Crohn's Diet. It will also assess compliance to the Crohn's Diet and if following it changes the nutritional balance from the normal diet.

• Other: The Crohn's Diet
  All recruited participants will be educated on the Crohn's Diet and instructed to adhere to the study diet for 14 days.

• :