Chronic inflammatory diseases (CID) - including inflammatory bowel diseases (Crohn's disease and ulcerative colitis), rheumatic conditions (rheumatoid arthritis, axial spondyloarthritis, psoriatic arthritis), inflammatory skin diseases (psoriasis, hidradenitis suppurativa) and non-infectious uveitis are treated with biologics targeting the pro-inflammatory molecule tumour necrosis factor-α (TNF), i.e. TNF inhibitors. Up to one third of the patients do, however, not respond to biologics and lifestyle is assumed to affect the treatment outcome. However, little is known on the effects of lifestyle as a prognostic factor (possibly enabling personalised medicine). The aims of this multidisciplinary collaboration are to identify lifestyle factors that support individualised forecasting of optimised treatment outcome on these costly drugs.