RT Journal Article T1 Pre-Pregnancy Adherence to the Mediterranean Diet and Gestational Diabetes Mellitus: A Case-Control Study. A1 Olmedo-Requena, Rocío A1 Gómez-Fernández, Julia A1 Amezcua-Prieto, Carmen A1 Mozas-Moreno, Juan A1 Khan, Khalid S A1 Jiménez-Moleón, José J K1 Mediterranean diet (MD), gestational diabetes mellitus (GDM), pregnancy K1 lifestyles K1 maternal nutrition AB Gestational diabetes mellitus (GDM), an important public health problem that affects mothers and offspring, is a common metabolic disorder. We evaluated the effect of the pre-pregnancy Mediterranean diet (MD) level of exposure on the odds of GDM development. A case-control study (291 GDM cases and 1175 controls without GDM) was conducted in pregnant women. Pre-pregnancy dietary intake was assessed using a validated food frequency questionnaire to calculate an MD adherence index (range score 0-9: low ≤ 2; middle 3-4; high 5-6; very high ≥ 7). Adjusted odds ratios (aOR) and their 95% confidence intervals (CI) were estimated using multivariable logistic regression models including age, BMI, family history of diabetes mellitus, previous GDM, miscarriages, and gravidity. Overall, middle-high MD adherence was 216/291 (74.2%) and very high adherence was 17/291 (5.8%) in cases. In controls the corresponding figures were 900/1175 (76.6%) and 73/1175 (6.2%), respectively. Compared to low adherence, high MD adherence was associated with GDM reduction (aOR 0.61, 95% CI 0.39,0.94; p = 0.028), and very high MD adherence was even more strongly associated (aOR 0.33, 95% CI 0.15, 0.72; p = 0.005). The protective effect of adherence to the MD prior to pregnancy should be considered as a preventive tool against the development of GDM. YR 2019 FD 2019-05-01 LK http://hdl.handle.net/10668/13907 UL http://hdl.handle.net/10668/13907 LA en DS RISalud RD May 13, 2025