IRCT20190227042858N1 IRCT 2019-07-18 Ahvaz University of Medical Sciences The effect of nutritional education on glycemic index based on Health Belief Model (HBM) on determining the risk of gestational diabetes mellitus among pregnant mother Investigating the effect of nutritional education on glycemic index based on Health Belief Model (HBM) on determining the risk of gestational diabetes mellitus among pregnant mother referring to health center, Omidiyeh. 2019-09-06 anticipated 90 Complete https://irct.ir/trial/37835 interventional Randomization: Randomized, Blinding: Not blinded, Placebo: Not used, Assignment: Parallel, Purpose: Prevention, Other design features: open label, Parallel - controlled randomized trial, Randomization description: using block randomization , two groups of intervention and control (using random numbers table). N/A Gestational Diabetes. Intervention 1: Intervention group: A general questionnaire and a physical activity questionnaire, a three-days food record and a researcher-made questionnaire based on the HBM model with subscales of; awareness, perceived susceptibility, perceived severity, perceived benefits, perceived barriers, self-efficacy and guidance for action before and after three-months will be collected .The education sessions is based on the dietary glycemic index of food items and their glycemic load and its effect on the maternal blood glucose, prevalence of gestational diabetes mellitus and its complications for mother and fetus, and prevention of gestational diabetes. At the end of the three-months intervention period, a face-to-face session, the HBM questionnaire, three-day food record and physical activity questionnaire will be collected. Intervention 2: Control group: Pregnant women in the control group receive routine pregnancy training and care. Undecided - It is not yet known if there will be a plan to make this available Justification or reason for indecision in sharing IPD is No more info.