Inclusion Criteria:  histological report confirming the diagnosis of IBD, value of C-reactive protein (CRP) fecal calprotectin, colonoscopy within 3 months from the enrollment.  Exclusion Criteria:  presence of ascites or edema, chronic or autoimmune inflammatory diseases, ongoing infections, recent surgery (in the last 6 months), neoplastic diseases, ongoing enteral or parenteral nutrition, presence of fistulae, ileostomy or colostomy, short bowel syndrome, pregnancy or lactation.