Second Line Induction Therapy and Healthy Diet for Patients With Ulcerative Colitis

Patients will do two 5-day cycles of a fasting mimicking diet. They will start the first diet cycle 1 week after initiating a new advanced therapy: Tofacitinib and Upadacitinib (JAK inhibitors), Infliximab (anti-TNF), Ustekinumab or Risankizumab (IL-23 inhibitors).

Patients in this group will start an advanced therapy and follow a diet solely based on dietary tolerance: new advanced therapy: Tofacitinib and Upadacitinib (JAK inhibitors), Infliximab (anti-TNF), Ustekinumab or Risankizumab (IL-23 inhibitors).