Prevention of neural tube defects and maternal gestational diabetes through the inositol supplementation: preliminary results

OBJECTIVE: Our study aims to demonstrate that the use in the preconceptional period until the 24th week of pregnancy of inositol and folic acid, first of all, preserves the product of conception from neural tube defects (NTDs) and then, thanks to inositol supplementation, it possibly counteracts and prevents the onset of maternal gestational diabetes (GDM).

PATIENTS AND METHODS: We have collected data derived from pregnant women arrived at our laboratory, from January 2014 to January 2016, with no family history of type 2 diabetes and hypertension. The first group (n = 68 women) was treated from the preconceptional period until the 24th week of pregnancy with 1.75 g/day myo-inositol, 250 mg/day D-chiro-inositol, 12.5 mg/day Zinc pidolate, 100 mg/day methylsulfonylmethane, 120 mg/day Vitamin C and 400 mcg/day (6S)-5-methyltetrahydrofolic acid. The control group (n = 72) was only treated with 400 mcg/day folic acid. The main outcome measure was the prevalence of maternal GDM. Secondary outcome measures were the prevalence of NTDs and fetal macrosomia.

RESULTS: A significant difference was found regarding body mass index (BMI), fasting oral glucose tolerance test (OGTT), after 1-h-glucose OGTT, 2-h-glucose OGTT, glycated hemoglobin (HbA1c) and serum folate, between the two groups. Five infants, in the control group, weighted greater than 4 kg. Moreover, we found a positive correlation between HbA1c and OGTT at the 24th week of pregnancy.

CONCLUSIONS: This study shows the efficacy of preconceptional supplementation of inositol to reduce the risk of the onset of GDM and to confirm the importance of folic acid supplementation to avoid NTDs development. Moreover, the positive correlation between HbA1c and OGTT may be useful to consider the use of HbA1c as a single tool for GDM prevention and diagnosis in selected woman in pregnancy.

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