The energy requirement of a pregnant woman increases by the following:

Question

Accepted Answer

The correct option is 1:
The scientific consensus and major dietary guidelines, such as those published by the American College of Obstetricians and Gynecologists (ACOG), recommend an increase of approximately 340 extra calories per day for a pregnant woman during the second and third trimesters. The option of **350 kcal** is the closest and most appropriate numerical value reflecting this standard recommendation for the period when fetal growth and maternal metabolic demands are highest. The total additional energy required over the entire pregnancy averages around 70,000 to 85,000 total kilocalories, which, when spread over the 280 days of gestation, equates to an average daily surplus of about 250 to 300 kcal. However, nutritional recommendations typically advise no extra calories in the first trimester, followed by the specific incremental increase of approximately 350 kcal/day in the subsequent trimesters to support the growth of the fetus, placenta, uterus, and maternal fat/protein stores. This tailored increase helps ensure an optimal gestational weight gain and positive pregnancy outcomes without promoting excessive caloric intake.

The incorrect option is 2:
**600 kcal** represents a substantial overestimate for the increased daily energy requirement of an average pregnant woman. This high value is far above the typical recommendation of 340-350 kcal and would generally only be advised for a small subset of pregnant women who are severely underweight, are carrying multiple fetuses, or who engage in very heavy physical labor. Providing an additional 600 kcal per day to a woman who does not need it would likely lead to excessive gestational weight gain, which increases the risk of complications such as gestational diabetes, pre-eclampsia, and a difficult delivery. Therefore, recommending 600 kcal as the standard increase for a pregnant woman is not aligned with established public health nutrition guidelines.

The incorrect option is 3:
**500 kcal** is significantly higher than the standard increase recommended for the majority of the pregnancy (second trimester), which typically begins at around 340-350 kcal/day. Some nutritional recommendations, particularly from older studies or for the specific demands of the third trimester, have suggested figures approaching 450-475 kcal/day, but 500 kcal is still on the high end of this range. As a general answer to the question of the *increase* across the crucial development period (second and third trimesters), 500 kcal overstates the average caloric need. Adopting an unnecessary 500 kcal daily increase can also contribute to unwanted weight gain that is neither beneficial for the mother nor the baby, making 350 kcal the safer and more widely accepted average for the heightened need.

The incorrect option is 4:
**400 kcal** is a historical or rounded figure that is slightly higher than the most commonly cited modern benchmark. Older theoretical calculations, such as those by Hytten, suggested an overall average of approximately 400 kcal per day to account for all energy costs over the full pregnancy, but this model is sometimes considered an overestimate because it did not fully account for the possibility of reduced physical activity during pregnancy. Furthermore, current guidelines like ACOG specify about 340 kcal/day, which is the figure that option 1 (350 kcal) most closely represents. Since 350 kcal is an available choice, it is the more precise and contemporarily supported answer compared to the higher, rounded estimate of 400 kcal.