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May 23, 2011 -- The amount of weight a woman gains or loses between a first and second pregnancy influences her risk for gestational diabetes, new research reveals.
In the study, which appears in the online issue of Obstetrics & Gynecology, researchers analyzed the medical records over a decade of more than 22,000 Northern California women who belonged to the same health plan. They looked at how many pounds a woman gained or lost between a first and second pregnancy, in normal weight and overweight women.
To find out whether interpregnancy weight changes affect a woman's risk for gestational diabetes, researchers used a measure called body mass index (BMI) units. (One BMI unit was about 6 pounds based on the average 5-feet 4-inches height of study participants.)
Scientists found that women who had gestational diabetes in their first pregnancy but not during their second gained the fewest BMI units. Women who did not have gestational diabetes in their first pregnancy but developed it in their second gained the most BMI units.
Gestational diabetes occurs when a pregnant woman develops elevated blood sugar levels. Higher-than-normal glucose levels during pregnancy can increase a woman's odds of having a larger baby and a more complicated delivery, and it also puts her and her child at greater risk of having type 2 diabetes later in life.
Gestational diabetes affects 2% to 10% of all pregnancies, according to the American Diabetes Association. Women who are overweight or obese before having a baby are at a greater risk for gestational diabetes.
