Nutritional requirements generally go up during pregnancy. which nutritional requirement proportionally increases the most during pregnancy?

Calories

B) Protein

C) Iron

D) Vitamin A

Explanation : According to the DRIs, when a woman is pregnant they do not required a significant increase of calories in the first trimester until the second trimester when the baby start to demand more nutrients as it develops further.An extra 340 cal/day is recommended during the second trimester. An extra 452 cal/day is recommended during the third trimester.The demand increase as the baby develops further .

The iron also need to be increased as demand for blood supply increases during pregnancy .