en تخصصي Special پژوهشي Research Ramadan, the holy month of Muslims, is the ninth month of the Islamic calendar. During fasting, plasma glucose levels and circulating insulin decrease gradually and counter regulatory hormones such as glucagon and catecholamines tend to rise. Diabetic Muslims who insist on fasting should be aware of potential complications and techniques of decreasing the risks. Muslims should be evaluated 2-4 weeks before Ramadan and high risk patients should not fast. Low risk patients should receive adequate education and appropriate medication change to cope with fasting. During Ramadan frequent blood glucose monitoring is an effective method for preventing hypoglycemia. Nutritional change is an essential component for safe fasting. In this article we was review studies that evaluate changes that would affect diabetic patients in Ramadan. Diabetes, Fasting, Nutrition, Ramadan 197 201 http://ijdo.ssu.ac.ir/browse.php?a_code=A-10-30-95&slc_lang=en&sid=1 Masoud Rahmanian Yes Assistant Professor of Yazd Diabetes Research Center, Shahid Sadoughi University of Medical Sciences, Yazd, Iran. Fateme Sadat Haghighi No MD, Community Medicine Specialist, Yazd Diabetes Research Center, Shahid Sadooghi University of Medical Sciences, Yazd, Iran Nasim Namiranian No MSc Yazd Diabetes Research Center, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.