Objective: This study explored the association between metabolic factors and body composition during the first trimester of gestational diabetes mellitus (GDM).
Methods: This prospective study recruited pregnant women in their first trimester. Clinical information and glucose and lipid measurements were collected, and body composition was assessed using multifrequency bioelectrical impedance analysis. GDM was diagnosed on the basis of an oral glucose tolerance test at 24– 28 gestational week. Factors related to GDM were investigated using correlation, and risk ratios (RRs) and 95% CIs of potential risk factors with GDM were estimated using Poisson regression. The area under the receiver operating characteristic (ROC) curve was used to determine predictive effects.
Results: 59/302 women (19.5%) developed GDM. Older (RR 1.076, 95% CI 1.005– 1.152), higher body mass index (BMI) before pregnancy (pre-BMI) (RR 1.012, 95% CI 1.005– 1.063), triglycerides (RR 4.052, 95% CI 1.641– 6.741), and lower skeletal muscle mass (SMM) to fat mass (FM) ratio (SMM/FM) (RR 0.213, 95% CI 0.051– 0890) in the first trimester, and family history of type 2 diabetes (RR 1.496, 95% CI 1.014– 2.667) significantly associated with the risk of GDM, but neither fasting plasma glucose nor glycated albumin was associated with GDM. The combined multivariate prediction model achieved good discrimination with an AUC of 0.806 (95% CI 0.737– 0.895, P < 0.001). According to ROC curve, the cut-off values of TG and SMM/FM were 0.925 mmol/L and 1.305.
Conclusion: Reduced SMM/FM and elevated triglyceride (TG) levels in the first trimester are associated with GDM development, and should be screened in early pregnancy to identify high-risk subjects for GDM.
Keywords: Gestational diabetes mellitus, ratio of muscle to fat, maternal triglyceride