How does gestational diabetes mellitus develop during pregnancy?

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An anatomical illustration of the human pancreas shows its location near the stomach and intestines, a detailed cross-section highlighting ducts and the islet of Langerhans, and an inset of pancreatic tissue histology with labeled alpha, beta, and delta cells. — diabetes mellitus The islets of Langerhans are responsible for the endocrine function of the pancreas. Each islet contains beta, alpha, delta, and pancreatic polypeptide (PP) cells that are responsible for the secretion of pancreatic hormones. Beta cells secrete insulin, a well-characterized hormone that plays an important role in regulating glucose metabolism.

Gestational diabetes mellitus is a temporary condition characterized by elevated blood glucose levels during pregnancy.

During a healthy pregnancy, the body naturally experiences increased insulin resistance due to the secretion of various placental hormones, such as progesterone, placental lactogen, and placental growth hormone. These hormones, along with others like cortisol, help ensure the fetus receives adequate nutrients.

Typically, the mother’s body compensates for this resistance by increasing insulin secretion. Gestational diabetes develops when this compensatory increase in insulin production is insufficient to overcome the resistance. This risk is further heightened by factors such as excessive weight gain, obesity, advanced maternal age, and a family history of diabetes mellitus. If the pancreas cannot produce enough insulin to maintain normal blood sugar levels, the resulting hyperglycemia defines the onset of the condition.1