For a patient diagnosed with acute exacerbation of Crohn's disease, which dietary recommendation is most appropriate?

A 26-year-old woman presents with right upper quadrant abdominal pain and vomiting for 1 day, with a history of a similar episode. There is tenderness in the right hypochondrium. Which investigation is the initial imaging test of choice to confirm acute cholecystitis or cholelithiasis?

Which vital sign should be monitored closely to detect early signs of infection or peritonitis in a patient with appendicitis?