Introduction: Despite being exempt, many Diabetic Muslims observe fasting during the month of Ramadan. We carried out this work to study the impact of this practice on body composition in this group of patients. Material and methods: We studied 176 Moroccan Muslim with type 2 diabetes. The study data were collected through a questionnaire, clinical examination and bioelectrical impedancemetry. The study variables were: weight, height, body mass index (BMI), body fat and visceral fat. Results: All patients who fasted the entire month of Ramadan and who met the study monitoring deadlines have been included. The average age was 57 years +/- 11 years; 79% were women. Despite a similar BMI, there was a reduction in weight (before: 76.85kg +/- 12.8 against 76.21kg +/- 12.8; p = 0.019), body fat (before: 28.43kg +/- 9.3 against 26.72kg +/- 8.3; p = 0.015) and visceral fat (before: 10.41 +/- 3.36 against 9.95kg +/- 3.2; p = 0.007). Conclusion: Ramadan fasting can be practiced in all safety with prior patient education and adjustment therapeutic. It also confers an improvement in the body composition, especially in women.