The plasma lipid levels were investigated in 45 celiac children under 3 years of age and 49 over this age at diagnosis (untreated groups), after gluten-free diet and in comparison with irritable bowel syndrome (IBS) groups matched for size, gender, and age. Total and HDL cholesterol levels were significantly lower and triglycerides higher in celiac untreated children than in IBS control children in both age groups. HDL cholesterol significantly increased in both age groups after some months of gluten-free diet. Total and LDL cholesterol significantly increased and triglycerides decreased in the younger group of subjects after the period of gluten-free diet. These results may be useful for diagnostic purposes and to motivate a strict gluten-free diet in celiac children.