Effect of Suplementation of Vitamin D in Gestational Diabetes Mellitus

Inclusion Criteria: Patients with a single pregnancy. * Patients diagnosed with GDM, which were diagnosed by a glucose tolerance curve 100 grams of glucose, with two altered results from the following: fasting\> 95 miligrams / deciliter, 1 hour\> 180miligrams / deciliter, 2 hour\> 155miligrams / deciliter, 3hous\> 140 miligrams / deciliter. * Gestational age between 24 -30 weeks confirmed with ultrasound of the 1st or 2nd trimester * Age between 18 and 40 years. Exclusion Criteria: Patients with pre-existing diabetes mellitus * Patients with predictive factors for vitamin D hypovitaminosis such as: use of anticonvulsants, renal disease, glomerular filtration rate \<60milliliters / minute, thyroid disease or any other pre-existing endocrinological disorders. * Hypercalciuria\> 300 miligrams / day * Patients taking vitamin D supplementation during the 6 months prior to the study (does not include polyvitamins with lower vitamin D concentrations \<500 IU) * Active and passive smoking patients.