The oral Neisseria/Leptotrichia ratio positively correlates to fasting blood glucose values that reflect the daily secretory capacity of basal insulin [84]; a low intestinal Faecalibacterium/Fusobacterium ratio corresponds to high blood glucose values [85] and a high vaginal Prevotella/Aerococcus ratio correlates to high blood glucose values [85]; GDM mothers showed a positive correlation between maternal fasting glucose and Acinetobacter abundance and a negative correlation with Prevotella [85]. Here, INS is linked to gestational diabetes.