RESUMEN
BACKGROUND: Gestational diabetes mellitus (GDM) is one of the most common metabolic dysfunction in pregnancy and as overweight and obesity are of the major risk factors. The aim of this study was to determine the effect of Information-Motivation and Behavioral skills (IMB) model-based counseling on preventing GDM in overweight and obese pregnant women. METHODS: This randomized controlled trial study was conducted on 137 pregnant women in two groups; education and counseling IMB model-based for four sessions (n = 70), and antenatal usual care (AUC) (n = 67). This study was conducted on overweight and obese pregnant women, at the 12 to 16 weeks' gestation and recruited from the Prenatal Clinic of Rohani Hospital in north of Iran. Blood glucose was measured before and 8 weeks after the intervention. Descriptive and inferential statistics including mean, frequency, t-test, chi-square and ANCOVA were used. RESULTS: The prevalence of GDM was lower in the intervention group than the control group (10% and 29.9%, respectively, RR = 0.33, CI 95% (0.15- 0.74) p = .004) as well as mean fasting blood glucose (Cohen's d = 0.28, p = .07), and glucose tolerance test at the first and second hour (d = 0.41 and Cohen's d = 0.73, respectively, p < .01). CONCLUSIONS: A lifestyle intervention in early pregnancy by IMB counseling in overweight and obese pregnant women can be effective in decrease GDM.
