Carbohydrate Intake Is Associated with OGTT Levels in Pregnancy

Background: Traditionally, a carbohydrate-rich diet in the days preceding an oral glucose tolerance test (OGTT) has been recommended based on classic studies in non-pregnant individuals showing that carbohydrate restriction elevates post-load glucose levels. Instructions on carbohydrate intake given to pregnant women having an OGTT for gestational diabetes (GDM) diagnosis vary. We tested if self-reported carbohydrate intake in pregnancy is associated with OGTT results. Methods: Pregnant women (N=79) with ≥ 1 risk factor for GDM underwent a fasting 75 g OGTT at 24-30 wks gestation and completed a 24-hr dietary recall using a validated self-administered instrument. We tested for an association between carbohydrate intake in the 24 hrs preceding the OGTT and 1-hour OGTT glucose using linear regression, with adjustment for age, BMI, gestational age, race, and total caloric intake. We also tested for associations with 30-minute and 2-hour OGTT glucose and glucose area under the curve (AUC). Results: Women with lower carbohydrate intake ( Conclusion: Carbohydrate restriction or excess before an OGTT may affect the diagnosis of GDM. Disclosure E. Rosenberg: None. K. James: None. J. Arenas: None. M.J. Callahan: None. M. Cayford: None. S. Nelson: None. S.N. Bernstein: None. R. Thadhani: None. E.W. Seely: None. C.E. Powe: None. Funding National Institutes of Health (K23DK113218); Robert Wood Johnson Foundation; Harold Amos Medical Faculty Development Award (72456)