The daily extra calorie requirement in first trimester of pregnancy is:
**Core Concept**
During pregnancy, the energy requirements increase to support the growth and development of the fetus, as well as to maintain the health and well-being of the mother. This increase in energy needs is essential for a healthy pregnancy outcome.
**Why the Correct Answer is Right**
The daily extra calorie requirement in the first trimester of pregnancy is approximately 340 calories. This increase is due to the growing embryo's demands for energy and nutrients. The mother's body also requires additional calories to maintain her own health and support the developing fetus. The Institute of Medicine recommends a total daily energy intake of approximately 1,900 calories for pregnant women in the first trimester.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as it underestimates the energy requirements during the first trimester.
**Option B:** This option is incorrect as it overestimates the energy requirements during the first trimester.
**Option C:** This option is incorrect as it is closer to the energy requirements during the second trimester.
**Clinical Pearl / High-Yield Fact**
The energy requirements during pregnancy increase by approximately 300-350 calories per day during the first trimester, and by an additional 340 calories per day during the second and third trimesters.
**Correct Answer: B. 340 calories.**