Introduction: Celiac disease (CD) is increasingly diagnosed and weight changes are common after adoption of a glutenfree diet (GFD) and there is concern that patients might gain further weight on a GFD. Objectives: This study examined toevaluate the impact of a GFD on the body mass index (BMI), whether favorable or unfavorable. Materials and methods: In this retrospective study, we reviewed electronic records of 44 patients with serologic study and intestinal biopsy confirmed CD who was visited in Nemazee hospital, Shiraz. All patients were put on GFD for 2 years and followed closely by pediatric gastroenterologist. BMIs were categories to four group underweight, normal weight, overweight and obese. Initial BMI and follow-up BMI was comparing together and also compared with general population. Result: At diagnosis, 27.27% of subjects were underweight, 63.64% normal and 9.09% were o...