Nutrition in twin pregnancy.
The urinary nitrogen output appears to be related to both protein and energy intake, so that women having heavier babies probably eat more, although this may simply mean that they are larger women. Women with twin pregnancies have been found to have a lesser urinary nitrogen output, but it seems unlikely that this be due to lower intakes. They might simply utilize their diet more efficiently--a hypothesis that is now being tested.
D001724:Birth Weight; D004044:Dietary Proteins / Q000378:metabolism; D002149:Energy Intake; D005260:Female; D005317:Fetal Growth Retardation / Q000209:etiology; D006801:Humans; D007231:Infant, Newborn; D009584:Nitrogen / Q000652:urine*; D009747:Nutritional Physiological Phenomena; D011247:Pregnancy; D011272:Pregnancy, Multiple; D014427:Twins
D004044:Dietary Proteins; D009584:Nitrogen