LEP and gestational diabetes: More interestingly, a study conducted by Yang et al. (76) in Chinese population, investigating the “association between gestational diabetes and plasma leptin levels, leptin G2548, and leptin receptor Gln223Arg polymorphisms” showed that “GDM was only associated with high plasma leptin levels rather that leptin Gln223Arg and leptin receptor polymorphisms.” Although, studies have reported on the association between plasma leptin levels and GDM, however, there are currently no studies that have reported on the association between leptin levels and GDM in the African population (Table 1).