GHRL and gestational diabetes: At present, the relationship between different metabolic variables of pregnancy and some specific bacteria has been found; for example, there is a negative correlation between insulin values and Blautia; arterial blood pressure and Odoribacter; and ghrelin insulin and Prevotellaceae. One study conducted a prospective observational and exploratory study of 41 patients with GDM and found that there was a correlation between C-reactive protein and Sutterella; circulating levels of insulin and Collinsella; and ghrelin and Bacteroidaceae [15].