OBJECTIVE -To investigate the potential use of the plasma homocysteine level as a predictor of diabetes in women with a previous history of gestational diabetes mellitus (GDM).RESEARCH DESIGN AND METHODS -At 6 weeks' postpartum, baseline examination was performed in 177 GAD-negative subjects. Of these subjects, 7 who were diagnosed with diabetes at baseline were excluded from further evaluation, and 170 with normal or impaired glucose tolerance (IGT) at baseline were followed annually over 4 years. The follow-up examinations included 2-h 75-g oral glucose tolerance tests (OGTTs), lipid profiles, homocysteine levels, anthropometric measurements, history taking, diet, and lifestyle. During the OGTTs, insulin and glucose levels were assayed every 30 min. Plasma homocysteine levels were determined by ion-exchange chromatography.RESULTS -Of the 170 women, 18 (10.6%) converted to diabetes during the 4-year follow-up period. Mean age, BMI, fasting insulin, and total cholesterol at baseline (6 weeks' postpartum test) were similar in the three study groups (i.e., normal, IGT, and diabetes). Fasting glucose levels, insulin-to-glucose ratios, and homocysteine levels were significantly higher in the diabetic group (P ฯฝ 0.05). Higher glucose at the time of the diagnosis of GDM and higher homocysteine levels at baseline were independently associated with the onset of postpartum diabetes. These relationships were independent of age, BMI, and family history of diabetes.CONCLUSIONS -This prospective study identified homocysteine level as a significant risk factor for development of diabetes in women with previous GDM.
Diabetes Care 28:2750 -2755, 2005G estational diabetes mellitus (GDM) is defined as carbohydrate intolerance of variable severity first recognized in pregnancy (1). GDM may complicate as many as 3-8% of all pregnancies in North America (2). Although the reported prevalence of GDM seems to be slightly lower in Asian countries (3,4), adverse outcomes are very similar in these two regions. Furthermore, women with GDM are at increased risk of later development of type 2 diabetes (5). Studies in Western populations have found conversion rates from 3 to 38% within the 1st year postpartum (6 -8). Although a limited number of such studies have been performed in Asian countries, studies in Hong Kong and Korea found a 20 and 38.3% prevalence, respectively, of impaired glucose metabolism in the early postpartum period (9,10).More than 4 decades ago, Wilkerson, O'Sullivan, and Mahan (5,11) initiated studies on glucose intolerance during pregnancy in an effort to identify women at risk of subsequent development of diabetes. The following clinical characteristics are reported to be key risk factors for development of diabetes postpartum: insulin requirement during pregnancy, earlier diagnosis of GDM during pregnancy, family history of diabetes, recurrence of GDM, increasing parity, maternal age, prepregnancy obesity, weight gain during pregnancy, and a previous macrosomic infant (12,13). Metabolic factors that predict risk of di...