This review paper examines the influence of dietary patterns on preeclampsia and obesity among pregnant women in the United States, aiming to elucidate the connection between nutrition and maternal health outcomes. The paper explores common dietary patterns, their impact on pregnancy complications, and the potential mechanisms through which nutrition affects maternal and fetal health. By synthesizing existing research, the review highlights the critical role of personalized dietary counseling and lifestyle interventions in improving pregnancy outcomes. It also emphasizes the need for comprehensive policy initiatives and future research directions to enhance maternal health through optimal nutrition and lifestyle modifications. Through a detailed analysis, the review underscores the importance of adopting healthy dietary patterns to mitigate risks and promote positive health outcomes for both mothers and their children.