In addition to preeclampsia, the risk of gestational diabetes also decreased in women who more closely followed the heart-healthy diet
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A new study by researchers from the Smidt Heart Institute at Cedars-Sinai has shown that women who conceived while following an anti-inflammatory diet had a lower risk of developing preeclampsia during pregnancy. The finding was part of a study that was assessing the Mediterranean diet and unfavourable pregnancy outcomes.
The study, published in the peer-reviewed journal JAMA Network Open, also evaluated the association between the Mediterranean diet and other adverse pregnancy outcomes, including gestational diabetes and hypertension, preterm birth, delivery of a small-for-gestational-age infant and stillbirth.
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"This multicenter, population-based study validates that a healthier eating pattern is associated with a lower risk of adverse pregnancy outcomes, the most exciting being a 28 per cent lower risk for preeclampsia," said Natalie Bello, MD, MPH, senior and corresponding author of the study and director of Hypertension Research in the Smidt Heart Institute, adding, "Importantly, this connection between the Mediterranean diet and lower risk of adverse pregnancy outcomes was seen in a geographically, racially and ethnically diverse population."
Bello also notes that researchers found the association was stronger in women who are traditionally considered to be of advanced maternal age, those 35 or older. Preeclampsia is a serious blood pressure condition that develops during pregnancy and puts stress on the mother's heart. Left untreated, the condition can cause serious complications like weakened kidney and liver function and decreased blood supply to the fetus.
In addition to preeclampsia, the risk of gestational diabetes also decreased in women who more closely followed the heart-healthy diet. The study was part of the Nulliparous Pregnancy Outcomes Study: Monitoring Mothers-to-be, which enrolled 10,038 women between 2010-2013. Of the women enrolled, 7,798 were included in the JAMA Network Open study.
Women who were pregnant with their first child were asked to complete a semi-quantitative food frequency questionnaire during their first study visit, which occurred in the first trimester. The questionnaire focused on the women's eating habits during the three months prior to their visit and asked the participants to report their intake of common foods and beverages. Individuals' responses were then categorized into the nine components of a Mediterranean diet--vegetables, fruits, nuts, whole grains, legumes, fish, monounsaturated-to-saturated fat ratio, red and processed meats, and alcohol--to calculate a Mediterranean diet score.
The data was compiled, analysed and studied by researchers and showed:
- Of the 7,798 women enrolled, 10 per cent were 35 years old or older, 11 per cent were non-Hispanic Black, 17 per cent were Hispanic, and 4 per cent were Asian.
- 20 per cent of enrollees had obesity at the onset of their participation.
- A high Mediterranean diet score was related to 21 per cent lower odds of having any adverse pregnancy outcome, as well as a 28 per cent and 37 per cent lower risk of having preeclampsia/eclampsia and gestational diabetes.
"We also looked at the individual components of the Mediterranean diet and found higher intakes of vegetables, legumes and fish were related to lower associated risk of an adverse pregnancy outcome," said Bello.
Christine Albert, MD, MPH, chair of the Department of Cardiology, who was not involved in the study, says that taken together, these findings uniquely demonstrate that in United States women, adoption of a Mediterranean diet pattern may represent an important lifestyle approach for the prevention of adverse pregnancy outcomes, particularly in women with advanced maternal age.
Previously, only three observational studies--each with a modest number of participants--have investigated the association of adherence to this healthful diet pattern around the time of conception and risk of developing preeclampsia.
"These findings add to the growing body of evidence demonstrating that the Mediterranean-style diet may play an important role in preserving the health of women across the lifespan, including during pregnancy," said Albert.
Bello says long-term studies are needed to assess whether promoting a Mediterranean-style diet around the time of conception and throughout pregnancy can prevent adverse pregnancy outcomes and reduce future cardiovascular risk.
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