Table 1.

Various combinations of these search terms were used. Both AND (between the groups) and OR (within the groups) were used. The “Similar articles”, “Cited by” functions in PubMed and references for key studies were used for finding more articles.

Group 1	Group 2	Group 3	Group 4	Group 5	Group 6
intestinal bowel disease, Crohn’s disease, ulcerative colitis, inflammatory bowel diseases, chronic inflammatory diseases	lifestyle factor, life style factors, diet, dietary, nutrients, dairy, dietary pattern, food, meat intake, fibre intake, vitamins, high salt diet	tumour necrosis factor, TNF, anti-TNF, treatment response, treatment outcome, treatment result, treatment efficacy, drug, infliximab, IFX, personalised medicine, personalized medicine	sulphate-reducing bacteria, mucolytic bacteria, mucosa-associated bacteria, epithelium-associated bacteria	metabolomics	prospective
IFX, Infliximab