Introduction:Despitebeing exempt, manyDiabeticMuslims observe fastingduring the month of Ramadan. Wecarried out thiswork to study the impact of this practice Lean body mass in this group of patients. Material and methods:Westudied 176 MoroccanMuslimwith type 2 diabetes. The study data werecollectedthrough a questionnaire, clinicalexamination and bioelectricalimpedancemetry. The study variables were:weight, height, body mass index (BMI), lean mass, body fat and visceral fat. Results:All patients whofasted the entiremonth of Ramadan and who met the study monitoring deadlines have been included. The averageagewas 57 years +/- 11 years; 79% werewomen. Despite a similar BMI, therewas a reduction in weight (before: 76.85kg +/- 12.8 against 76.21kg +/- 12.8; p = 0.019), from 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). Lean body mass has not changed, but stratification by sexshowed a significantincrease in women (before: 44.15 +/- 5.7 against 44.71kg +/- 5.7; p = 0.043). Conclusion:Ramadan fasting can bepracticed in all safetywithprior patient education and adjustmenttherapeutic. It alsoconfers an improvement in the body composition, especially in women.