Main Findings
Dietary factors have been implicated in the development and severity of endometriosis.21 To date, most studies related to diet and endometriosis have focused on incident diagnosis of endometriosis among women based on dietary intake in adulthood. To our knowledge, this is the first report that used the Japanese largest birth cohort and examined the effect of prepregnancy anti-inflammatory diet on obstetric outcome in women with endometriosis. The obstetric outcome was not affected by ART. The magnitude of aORs in the present study suggested a distinctive effect of anti-inflammatory diet on more severe obstetric outcome, specifically PTB before 34 weeks and LBW <1500 g among women with endometriosis.