Introduction: Fetal growth restriction (FGR) is a major public health problem. There is no therapeutic option in cases without cause. Iranian traditional therapists use special foods which according to the laws of Persian (Iranian) medicine promote growth of the body during pregnancy to improve the growth of fetuses with FGR. In this study, the effectiveness of a balanced diet containing recommended Persian (Iranian) medicine sources and a classic balanced diet, in the weight gain of asymmetric FGR fetuses, was compared. Method: A randomized clinical trial was performed on 64 pregnant women with asymmetric causeless FGR. Patients were randomly assigned to two groups and each group received a balanced diet. Types of food were different in the two groups. Biometric ultrasound was repeated every two weeks. Repeated measures analysis of variance was used to assess effect of the intervention on continuous variables during three different measurements including fetal weight; abdominal circumference and mother’s weight. Results: In this study, although there was no significant difference between macronutrients and micronutrients (after adjusting for magnesium difference), the weight gain of the fetuses in the intervention group was significantly higher than in the control group (p<0.001), similarly, the abdominal circumference of the fetuses was higher (P=0.002). However, there was no significant difference in maternal weight gain in the two groups (P=0.880). Conclusion: Taking into account previous findings, the potential of treatment via nutrition as a low-complication and non-invasive method should not be ignored in the treatment of FGR.
