[Interaction between dietary cholesterol intake and the risk of gestational diabetes mellitus]

Objective: To investigate the influence of dietary cholesterol intake on gestational diabetes mellitus (GDM), at one year prior to and first and second trimesters of pregnancy. Methods: Between March 2012 and September 2016, the pregnant women from the First Affiliated Hospital of Shanxi Medical University were asked to fill in a set of questionnaires, by which information on general demographic characteristics, diagnosis of GDM and dietary cholesterol intake was collected. Unconditional logistic regression method was used to analyze the influence of dietary cholesterol intake on GDM, at one year prior to and first and second trimesters of pregnancy. The association on dietary cholesterol intake and GDM between age groups was also analyzed. Results: Data on 9 005 subjects, including 1 388 pregnant women with GDM, was collected. When the amount of cholesterol intake was stratified into quartile, results from the unconditional logistic regression showed that dietary cholesterol intake appeared ≥76.50 mg/d, both in the periods of one year prior to and the second trimester of pregnancy. This amount of dietary cholesterol intake would increase the risk of GDM (one year prior to pregnant: OR=1.230, 95%CI: 1.018-1.485; second trimester: OR=1.228, 95%CI:1.014- 1.486). Women who took ≥76.50 mg/d of daily cholesterol during the period of one year prior to, or 46.75-76.50 mg/d during the second trimester of pregnancy, the risks of GDM (OR=4.644, 95%CI: 1.106-19.499) would increase. Women with daily cholesterol intake over 76.50 mg/d during the period of one year prior to or at the second trimester of pregnancy, there appeared a risk on GDM (OR=1.217, 95%CI: 1.012-1.463). When maternal age was divided in two different subgroups and the cholesterol intake level was ≥76.50 mg/d both in the period of one year prior to pregnancy or at the second trimester, the risk of GDM appeared in the subgroup of<35 years old (OR=1.336, 95%CI:1.083-1.647; OR=1.341, 95%CI: 1.087-1.654). However, no significant association was found in the maternal age group of ≥35 years old. Conclusion: High level of dietary cholesterol intake would increase the risk of GDM, both in the period of one year prior to and at the second trimester of pregnancy.