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Many correlational (ecologic) studies and analytic (i.e., case-control and cohort) studies have been conducted to investigate whether fat and other dietary items contribute to the etiology of breast cancer or not. However, these studies has not established firm conclusion yet. The estimated relative risks could not reveal the strong association and the cohort studies haven’t found positive association. The major problems in these analyses stem from the methodological limitations related to methods of dietary data collection and quantification. The possible protective role of yellow-green vegetables to breast cancer was discussed, and the need of standardization of the questionnaire to evaluate dietary habits was suggested.