Extra energy, needed per day during pregnancy-
**Core Concept**
During pregnancy, there is an increased demand for energy due to the growth and development of the fetus, placenta, and other maternal tissues. This increased energy requirement is essential for maintaining the health and well-being of both the mother and the fetus.
**Why the Correct Answer is Right**
The estimated daily energy requirement for pregnant women increases by 10-15% above the pre-pregnancy level. This is due to the increased metabolic rate and the energy expended by the fetus, placenta, and other maternal tissues. The Institute of Medicine recommends an additional 300 calories per day for pregnant women during the second and third trimesters.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because this option is too low, and the actual energy requirement is higher than the pre-pregnancy level.
**Option B:** Incorrect because this option does not account for the increased energy demand during pregnancy.
**Option C:** Incorrect because this option is too high and not supported by scientific evidence.
**Clinical Pearl / High-Yield Fact**
A pregnant woman's energy requirement increases by 10-15% above her pre-pregnancy level, which is equivalent to an additional 300 calories per day during the second and third trimesters.
**Correct Answer:** D