Late pregnancy calorie requirement is
**Core Concept**
In late pregnancy, the body undergoes significant physiological changes to support the growth and development of the fetus, placenta, and maternal tissues. This period is characterized by increased energy demands due to the heightened metabolic rate, increased blood volume, and enhanced tissue growth.
**Why the Correct Answer is Right**
The increased calorie requirement in late pregnancy is estimated to be around 300-350 kcal/day above the non-pregnant state. This is primarily attributed to the increased energy expenditure associated with fetal growth, placental development, and maternal tissue growth. The additional calorie requirement is also influenced by the increased basal metabolic rate, which is thought to be around 15-20% higher in pregnancy.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately reflect the increased calorie requirement in late pregnancy.
**Option B:** This option is incorrect because it suggests a calorie deficit, which is not supported by scientific evidence.
**Option C:** This option is incorrect because it does not provide a specific estimate of the increased calorie requirement.
**Clinical Pearl / High-Yield Fact**
It is essential to note that the increased calorie requirement in late pregnancy is not just about calorie intake, but also about the quality of nutrients, including protein, iron, and folate, to support fetal growth and development.
**Correct Answer: C. 350 kcal/day.**