The average increase in body mass d

怀孕期间体重的平均增加量约为女性<br>原始体重的13%，平均正常增加量在 25 至 32 磅之间。在怀孕期间，母体脂肪稳步增加，直到妊娠后期趋于平稳或下降。前两个三个月的脂肪储存部分是由于与雌激素水平升高相关的β细胞增生导致胰岛素产生增加。发生脂肪堆积是为了提供能量储备，以支持随着妊娠进展和产后泌乳加速胎儿生长（McMurray 等，1993）。由于怀孕期间代谢需求的增加，每天需要额外增加 300 卡路里的热量。需要更多的卡路里来满足定期锻炼的需求。

The average increase in body mass during pregnancy is about 13% of the woman’soriginal body weight, with the average normal gain between 25 and 32 pounds. During pregnancy, maternal adipose increases steadily until late gestation when it tends to plateau or decline. Fat storage in the first two trimesters is due in part to an increase in insulin production that results from beta cell hyperplasia associated with elevated estrogen levels. Fat accumulation occurs in order to provide an energy reserve to support accelerated fetal growth as pregnancy progresses and for postpartum lactation (McMurray et al., 1993). Because of the increased metabolic demands of pregnancy, 300 additional calories per day are required. Even more calories are needed to meet the demands of regular exercise.<br>

怀孕期间身体质量的平均增长大约是女性的13%原始体重，平均正常体重在25到32磅之间。在怀孕期间，母体脂肪稳步增加，直到怀孕后期趋于稳定或下降。前两个三个月的脂肪储存部分是由于与雌激素水平升高相关的β细胞增生导致的胰岛素产量增加。脂肪积累的发生是为了提供能量储备，以支持妊娠过程中胎儿的加速生长和产后哺乳(McMurray等人，1993)。由于怀孕的代谢需求增加，每天需要额外的300卡路里。为了满足经常锻炼的需求，甚至需要更多的卡路里。