International Board of Certified Lactation Consultant (IBCLC) Practice Exam

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What percentage of an infant's energy is derived from lactose in mature human milk?

  1. 30%

  2. 40%

  3. 50%

  4. 60%

The correct answer is: 40%

In mature human milk, approximately 40% of an infant's energy is derived from lactose. Lactose is the primary carbohydrate found in human milk, and it plays a significant role in providing energy for infants. This carbohydrate is not only important for energy but also aids in calcium absorption, promoting healthy growth and development. Lactose's composition in human milk helps in the efficient digestion and metabolism for infants, as they have evolved to thrive on this specific nutritional profile. The balance of macronutrients in human milk, including fats and proteins, further supports the overall energy needs and development of the infant. Understanding the proportion of lactose in human milk is vital for lactation consultants when advising breastfeeding mothers and assessing the nutritional adequacy of an infant's diet. Recognizing that approximately 40% of the energy in mature human milk comes from lactose helps guide care practices and support breastfeeding initiatives effectively.

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