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Obese pregnancy risk, despite healthy diet - futurity.org

 The nutrient supply region in the placenta of an obese mother is half the size of that of a normal-weight mother, even when both are eating the same healthy diet,” says Yuan-Xiang Pan, a University o...

 The nutrient supply region in the placenta of an obese mother is half the size of that of a normal-weight mother, even when both are eating the same healthy diet,” says Yuan-Xiang Pan, a University of Illinois professor of nutrition.

Lemon Diet

Pan blames what he calls the obesogenic environment of the mother, which includes increased triglycerides, high levels of the hormone leptin, and elevated amounts of non-esterified fatty acids (NEFAs) circulating in the obese expectant mother’s body.

As reported in the journal Biology of Reproduction, triglyceride and NEFA levels are nearly twice as high in obese mothers, even when they consume healthy diets during pregnancy, he says.


“My advice is, lose weight well before you become pregnant,” Pan says.

Lemonade Diet

In the study, the scientist compared the placentas of obese rats fed a healthy diet throughout their pregnancies with the placentas of obesity-resistant rats fed the same diet.


“Although the obese females didn’t gain much weight on the healthy diet, the obesogenic environment remained, and it affected nutrient transport regulation in the placenta,” he says.


As a result, obese mothers gave birth to babies that were up to 17 percent smaller than they should have been. The consequences for those infants may be lifelong, making them more susceptible to disease, he notes.


Pan, an epigeneticist, was able to demonstrate for the first time that the DKK1 gene regulates certain aspects of lipid metabolism in the placenta through the WNT signaling pathway.


“Understanding this process should help us identify some biomarkers that would allow a potential mother’s doctor to say yes, you’ve lost weight, the chemical conditions that were created by your excess weight are gone, and this is a good time for you to become pregnant,” he says.


Biomarkers could also be useful in testing new babies. If doctors can see that the mother’s pre-pregnancy and pregnancy diets were deficient, there might be ways to compensate for that poor prenatal environment, he says.


“The point I’d like to get across to women of child-bearing age is that they must pay attention to their weight well before they become pregnant if they want to have a healthy baby.


“Obesity creates unhealthful conditions in the mother’s body that take time to correct. A healthy mother will give birth to a baby that is more resistant to disease,” he says.


Rita Strakovsky, of the Division of Nutritional SciencesFeature Articles, is a co-author.

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Ramya, Chennai



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