International Board of Certified Lactation Consultant (IBCLC) Practice Exam

What role does insulin play in lactogenesis?

1. It inhibits milk production

2. It stimulates milk duct development

3. It provides energy for milk synthesis

4. It balances electrolytes in breast milk

The correct answer is: It provides energy for milk synthesis

Insulin is a crucial hormone in the process of lactogenesis, particularly during the synthesis of milk. It plays a significant role in providing the necessary energy for milk production. This energy is sourced from glucose, which is regulated by insulin levels in the blood. Adequate insulin facilitates the uptake of glucose into cells, allowing lactocytes (the milk-producing cells in the mammary glands) to convert this glucose into lactose, the primary carbohydrate found in breast milk. During lactation, insulin also supports the metabolism of fat and protein, contributing to overall milk composition. In this context, insulin is vital for maintaining the energy balance required for effective milk synthesis, making the choice of its role in providing energy for milk synthesis the correct answer.