The month of Ramadan, the 9 th month of the Islamic lunar calendar, is a holy month in the Muslim religion. During this period, Muslims must fast from dawn until sunset. The Holy Qur'an specifically exempts people with a medical reason from observing the fast, especially if this can have negative consequences on their health. [1] During the fasting, diabetic patients, because of their pathology, are exposed to an increased risk of hypoglycemia, loss of diabetes control, dehydration (especially in summer) and thromboembolic complications. Also, there are disturbances of chronobiology due to a change in the daily rhythm, marked by frequent disturbances in sleep, and a nocturnal diet. Because of all this, it is recommended for patients with T2DM who are uncontrolled, unstable, or have diabetes-related complications to avoid fasting. [1,2] Some patients proceed with fasting despite their physician's disagreement and the presence of a religious exemption. [1] We aimed to study the consequences of fasting and changes in eating habits on certain clinical and biological parameters in a group of diabetic patients compared to a control group and to derive some recommendations based on the results obtained. suBjEcts and MEthods Study designWe conducted an observational, descriptive and comparative study. We included 31 subjects divided into two groups: group 1 composed of 15 patients with T2DM, recruited from patients attending the National Institute of Nutrition in

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