A group of 81 teenage coeliac patients were recently followed to monitor their compliance with a gluten free diet and also to correlate this with: their general wellbeing, height and weight, antigliadin and antiendomisyal antibody levels and jejunal mucosa patterns. Fifty two patients (64.1%) were on a strict gluten free diet; 18 (22.3%) admitted an occasional gluten intake; 11 (13.6%) were on a normal diet. Symptoms were more frequent in non-compliers that in compliers. There was no appreciable difference between the groups in regard to height and body-mass index, but patients on a normal diet were lighter than the others. Small bowel biopsy was performed on 18 patients with various histological findings. Antigliadin antibodies and antiendomysium antibodies were good indications of a patient's gluten free diet compliance and mucosal damage.