A case–control study published in 2016 using data from the Danish National Birth Cohort demonstrated that women in the highest quintile of plasma ferritin measured at 6–12 gestational weeks had a statistically significant and > 2-fold increased risk of developing GDM after controlling for main risk factors of GDM, including CRP and prepregnancy BMI, compared with the lowest quintile [18]. Here, CRP is linked to gestational diabetes.