Scientists shocked by obesity discovery

Scientists shocked by obesity discovery

If you're overweight, that's very bad news for your children, a new study is claiming.

A new study published in the Journal of Pediatrics has a major warning about obesity: specifically, obese parents may be putting their children at risk of developmental delays. That means being overweight impacts not only your own health, but also the future development of your soon-to-be child.

Approximately one in five women are obese in the United States when they get pregnant, which is defined as having a body mass index above 30, whereas the healthy range is 18.5 to 24.9. But studies have focused on the mother and not taken the father into account, and this latest study suggests that an overweight father can also put the child at a developmental risk, a stunning discovery.

Scientists based the study on an examination of 4,821 children who were between the ages of 4 months and 3 years between 2008 and 2010 and compared them based on the weight of their parents. They found that children of obese mothers were more likely to have difficulty with the development of small muscles on the fingers and hands, and they were also more likely to struggle with personal-social skills and cognitive development.

The statement from the National Institutes of Health is below.

Children of obese parents may be at risk for developmental delays, according to a study by researchers at the National Institutes of Health. The investigators found that children of obese mothers were more likely to fail tests of fine motor skill–the ability to control movement of small muscles, such as those in the fingers and hands. Children of obese fathers were more likely to fail measures of social competence, and those born to extremely obese couples also were more likely to fail tests of problem solving ability.

The study, appearing in Pediatrics, was conducted by scientists at the NIH’s Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD).

“The previous U.S. studies in this area have focused on the mothers’ pre- and post-pregnancy weight,” said the study’s first author, Edwina Yeung, Ph.D., an investigator in NICHD’s Division of Intramural Population Health Research. “Our study is one of the few that also includes information about fathers, and our results suggest that dad’s weight also has significant influence on child development.”

Dr. Yeung and her coauthors cited research indicating that about 1 in 5 pregnant women in the United States is overweight or obese.

In the study, authors reviewed data collected from the Upstate KIDS study, which originally sought to determine if fertility treatments could affect child development from birth through age 3. More than 5,000 women enrolled in the study roughly 4 months after giving birth in New York State (excluding New York City) between 2008 and 2010. To assess development, parents completed the Ages and Stages Questionnaire after performing a series of activities with their children. The test isn’t used to diagnose specific disabilities, but serves as a screen for potential problems, so that children can be referred for further testing.

Children in the study were tested at 4 months of age and retested 6 more times through age 3. When they enrolled, mothers also provided information on their health and weight–before and after pregnancy–and the weight of their partners.

Compared to children of normal weight mothers, children of obese mothers were nearly 70 percent more likely to have failed the test indicator on fine motor skill by age 3. Children of obese fathers were 75 percent more likely to fail the test’s personal-social domain–an indicator of how well they were able to relate to and interact with others by age 3. Children with two obese parents were nearly three times more likely to fail the test’s problem solving section by age 3.

It is not known why parental obesity might increase children’s risk for developmental delay. The authors note that animal studies indicate that obesity during pregnancy may promote inflammation, which could affect the fetal brain. Less information is available on the potential effects of paternal obesity on child development. The authors added that some studies have indicated that obesity could affect the expression of genes in sperm.

If the link between parental obesity and developmental delays is confirmed, the authors wrote, physicians may need to take parental weight into account when screening young children for delays and early interventional services.

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