INS and gestational diabetes: However, another small study reported that plasma taurine (measured after a median period of 6 years from index pregnancy) was significantly lower in women who had experienced GDM and was inversely related to the previous gestational area-under-curve glucose and had a positive relation to post-gestational C-peptide/FPG as well as to C-peptide/FPG measured during pregnancy27, suggesting that plasma taurine may be inversely related to insulin secretion during pregnancy, as well to that of women in postpartum.