How do pregnancy and lactation alter daily energy and nutrient requirements?

• A. They decrease energy needs.
• B. They do not change energy or nutrient requirements.
• C. They only affect energy needs but not nutrient requirements.
• D. They increase energy needs and specific nutrient requirements (e.g., folate, iron, calcium) to support fetal development and milk production.

Answer: (D)

During pregnancy and lactation, the body must support fetal growth and milk production, so both energy and many nutrients are needed in greater amounts. Energy needs rise to fuel the developing fetus, the placenta, the increased maternal blood supply, and the extra work of growing tissues; later, milk production adds even more energy cost. In pregnancy, the additional calories are typically about 300–500 kcal per day, varying by trimester, with a larger increase in the third trimester. In lactation, about 500 extra kcal per day is often recommended to support milk synthesis. Along with more calories, several nutrients must increase specifically—folate for early fetal neural development, iron to support expanded maternal red blood cells and fetal iron stores, calcium and vitamin D for fetal bones and breast milk, iodine for thyroid hormone production, and higher protein intake plus other vitamins and minerals like B12, choline, and DHA for overall development. Meeting these increased needs helps prevent deficiencies that could affect both the baby's growth and the mother's health, as well as milk production.