biostudies-literatureUnknown7(7)Friel C<h4>Importance</h4>Prenatal diet may be causally related to autism; however, findings are inconsistent, with a limited body of research based on small sample sizes and retrospective study designs.<h4>Objective</h4>To investigate the associations of prenatal dietary patterns with autism diagnosis and autism-associated traits in 2 large prospective cohorts, the Norwegian Mother, Father, and Child Cohort Study (MoBa), and the Avon Longitudinal Study of Parents and Children (ALSPAC).<h4>Design, setting, and participants</h4>This cohort study used data from MoBa and ALSPAC birth cohort studies conducted across Norway and in the Southwest of England, respectively. Participants were people with singleton pregnancies with self-reported food frequency questionnaire responses. MoBa recruited betweenJAMA network opene2422815https://www.ebi.ac.uk/biostudies/studies/S-EPMC11258593biostudies-literatureHealthy Prenatal Dietary Pattern and Offspring Autism.PMC11258593Leyland AHHavdahl AFriel CAnderson JJBrantsæter ALDundas RfalseHealthy Prenatal Dietary Pattern and Offspring Autism.<h4>Importance</h4>Prenatal diet may be causally related to autism; however, findings are inconsistent, with a limited body of research based on small sample sizes and retrospective study designs.<h4>Objective</h4>To investigate the associations of prenatal dietary patterns with autism diagnosis and autism-associated traits in 2 large prospective cohorts, the Norwegian Mother, Father, and Child Cohort Study (MoBa), and the Avon Longitudinal Study of Parents and Children (ALSPAC).<h4>Design, setting, and participants</h4>This cohort study used data from MoBa and ALSPAC birth cohort studies conducted across Norway and in the Southwest of England, respectively. Participants were people with singleton pregnancies with self-reported food frequency questionnaire responses. MoBa recruited between2024-01-01T00:00:00Z2024 Jul2025-04-04T03:19:46.586Z2025-04-04T03:19:46.586ZS-EPMC112585933902389110.1001/jamanetworkopen.2024.22815