E-Mail DALLAS, Feb. 1, 2021 -- Women with a history of diabetes during pregnancy (gestational diabetes) are twice as likely by mid-life to develop calcium in heart arteries - a strong predictor of heart disease - even if healthy blood sugar levels were attained many years after pregnancy, according to new research published today in the American Heart Association's flagship journal Circulation. Gestational diabetes, which is high blood sugar levels (glucose intolerance) first recognized during pregnancy, affects approximately 9% of U.S. pregnancies and up to 20% worldwide. After pregnancy, women who had gestational diabetes are at higher risk of developing prediabetes or Type 2 diabetes, conditions that are risk factors for cardiovascular disease.