Healthy fats, which can be found in fish, seeds, nuts, and vegetable oils, may reduce a woman's risk of having a child with autism.
See Lyall et al 2013 - Maternal dietary fat intake in association with autism spectrum disorders
Published in the Journal of American Epidemiology by the Harvard School for Public Health, the study examined maternal intake of certain fatty acids across mothers whose children have autism and those whose do not. The study found that women who consumed linoleic acid — a type of omega-6 acid found in vegetable oils, nuts, and seeds — were 34 percent less likely to birth a child with autism, while women who consumed low levels of omega-3 fatty acids — those found in fish — were 53 percent more likely.