With special reference to diet, we epidemiologically assessed the factors which would modify the morbidity of ovarian cancer. As a result of the case-control study, the women with post menopause-occurring ovarian cancer used to eat meat and fish more frequently. This finding is consistent with the results from some correlation studies, which showed the possible association between ovarian cancer and fat consumption. Further, the ovarian cancer patients used to drink milk less frequently. This finding was still significant even if other risk factors were simultaneously taken into consideration. Regarding these results, several etiological inferences were discussed.