Abstract : A lot of diabetic Muslims choose to fast during Ramadan, despite recommendations that advise some patients to abstain according to established risk factors. Fasting exposes the diabetic subject to acute major complications, including diabetic ketoacidosis and severe hypoglycaemia. Patients with diabetes, therefore, had to benefit from individualized care already before Ramadan, including a risk assessment, a specific education integrating in particular the adaptation of the pharmacological treatment in order to limit the occurrence of these acute complications.