Why do insulin-producing cells in the pancreas enlarge during pregnancy?

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During pregnancy, the islets of Langerhans—the specific regions of the pancreas responsible for secreting insulin—increase in size.1

This enlargement is considered a balanced physiological response to the body's heightened demand for the products of carbohydrate metabolism during gestation. While the level of plasma insulin rises during pregnancy, the body also experiences more rapid destruction of insulin, necessitating this increased production capacity. This adaptation helps the body manage the metabolic changes associated with pregnancy, though in some women with a marginal pancreatic reserve, these increased demands can lead to the development of gestational diabetes.12