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Background & Aims of the Study: Preeclampsia is the most common clinical symptom of pregnancy period. According to the importance of preeclampsia and the lack of definite and effective factors on it, this study was performed by the aim of survey the relationship between diet and occurrence of preeclampsia in the pregnant women of Tehran city in 2012. Materials & Methods: This longitudinal study (prospective) was performed on 1033 pregnant women in prenatal clinics in Tehran city. At the beginning of the study, it were completed the food eating frequency and demographic questionnaires from all samples once before twentieth week through face to face interviews. Nutritional data that were achieved from the questionnaire of every understudied unit that recorded all of foods consumed by mother were changed to the gram by the researcher and analyzed by the software of N4 to calculate nutrient intake of mothers. Pregnant women were followed since the entrance to the study to the time of delivery. The significance level used in the tests was less than 0.05. Results: Twenty pregnant women (1.9%) form 1033 studied women were diagnosed preeclampsia. The results of independent T-test showed that the average intake level of antioxidant nutrients (such as zinc, vitamin A, C, E) in women with preeclampsia were significantly low. Conclusions: The results showed that the reduction in daily intake of antioxidant nutrients is associated with the occurrence of preeclampsia