Introduction: Premenstrual syndrome is one of the most common disorders in women of childbearing age. Since the main cause of this syndrome is unknown. Adherence to an appropriate dietary pattern concerning drug treatment methods is safe, low-cost, and lowcomplication. This study aimed to evaluate the level of physical activity and dietary patterns based on the food pyramid and MY PLATE on the severity of the premenstrual syndrome. Methods: 45 female students living in medical dormitories of Mazandaran were selected in each group (case and control). The initial sampling method was easy and purposeful. In the first stage of the study, anthropometric indices were collected by a questionnaire. The American College of Obstetrics and Gynecology (ACOG) diagnostic criteria were used to assess the frequency and severity of PMS symptoms. They were moderate to moderate in severity and were diagnosed as PMS. 45 people in each case and control group were eligible to participate in the trial. Next, individuals filled out a food pyramid questionnaire and were asked about my plate pattern. On paper and the blank my plate pattern (empty plate representing a person's normal intake filled in by individuals) the shares for each group. In this food pattern, they specify. It was also recalled that 24-hour food was received 2 days before menstruation. Results: In the bread and cereals group, there was a significant relationship between the consumption of lavash bread and pasta and the severity of PMS symptoms. Also, a significant relationship was found between the consumption of fruits and sweets and the severity of PMS symptoms Conclusion: In general, eating whole grains, and fruits, and reducing the intake of simple carbohydrates and sweets can be effective in relieving the symptoms of PMS.