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Your immune system may be sounding the alarm on IBD years before you feel anything. Researchers found distinct antibody patterns in the blood up to 10 years before a Crohn's disease or ulcerative colitis diagnosis — and AI models could distinguish future patients from healthy individuals with impressive accuracy. This could eventually pave the way for earlier detection and more targeted treatment.
Scientists have discovered that the immune system undergoes measurable changes up to 10 years before a person is diagnosed with inflammatory bowel disease (IBD). Presented at UEG Week 2026, the study analyzed blood samples from 500 people — including those who later developed Crohn's disease (CD) or ulcerative colitis (UC) — and found that distinct antibody patterns could differentiate future IBD patients from healthy individuals years before any clinical symptoms emerged.
The team screened antibody responses to ~357,000 antigens across 2,000 samples and identified nearly 124,000 unique antibodies. People who later developed IBD showed notably less antibody diversity than healthy controls. CD was linked to elevated responses to herpesviruses and bacterial flagellin, while UC showed increased responses to herpesviruses and autoantigens — with both conditions showing declining responses to encapsulated bacteria over time.
By the Numbers
Why it matters: Earlier identification of IBD risk — and disease severity — could allow clinicians to intervene sooner, potentially preventing complications and tailoring treatment intensity before the disease fully takes hold.
