Biologics and Partial Enteral Nutrition Study

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80 adult patients with active CD who are due to start biologic injections therapy with adalimumab as part of their standard of care for the first time will be recruited for this study. Patients will be randomly allocated to replace either half of their normal diet with nutritionally complete milkshakes or to follow their usual diet for 6 weeks. The investigators will compare the proportion of patients whose symptoms and disease markers will improve between the two groups at 6 and 12 weeks, and how many of them will remain symptoms-free for up to a year following treatment. The investigators will also explore whether the half-liquid diet will influence patients' nutrition and quality of life. Last, the investigators will investigate if gut bacteria changes and their metabolites associate with patients' eating habits and their responses to treatment with biologics. The primary aim of the BIOPIC study is to investigate if replacement of 50% of habitual food intake with a proprietary liquid diet for 6 weeks will improve remission rates at 12 weeks in adult patients with active ileocolonic CD treated with first-line biologics (TNFα antagonists, adalimumab) as their standard treatment of care. The secondary aim is to investigate if replacement of 50% of habitual food intake with a proprietary liquid diet for 6 weeks will prolong remission in adult patients with active ileocolonic CD treated with first-line biologics (TNFα antagonists) as their standard treatment of care.