Women, particularly minorities, do not meet nutrition guidelines shortly before pregnancy
Black, Hispanic and less-educated women consume a less nutritious diet than their well-educated, white counterparts in the weeks leading up to their first pregnancy, according to the only large-scale analysis of preconception adherence to national dietary guidelines. The study also found that, while inequalities exist, none of the women in any racial and socioeconomic group evaluated achieved recommendations set forth by the Dietary Guidelines for Americans. Ref. Source 4y.
While this study is interesting I would like to see them compare less educated minorities diet to well educated minorities diet to see if there is a correlation there. Let them compare apples to apples and oranges to oranges instead of trying to make it look racial.