American Journal of Clinical Nutrition, Vol 57, 494-505, Copyright © 1993 by The American Society for Clinical Nutrition, Inc

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Longitudinal assessment of energy expenditure in pregnancy by the doubly labeled water method

GR Goldberg, AM Prentice, WA Coward, HL Davies, PR Murgatroyd, C Wensing, AE Black, M Harding and M Sawyer
MRC Dunn Clinical Nutrition Centre, Cambridge, UK.

Twelve women were studied before pregnancy and at 6-wk intervals from 6 to 36 wk gestation. Total energy expenditure (TEE) by the doubly labeled water method, basal metabolic rate (BMR), energy intake, and body composition were assessed on each occasion. There was substantial interindividual variation in the response to pregnancy. Mean total energy costs were as follows: delta BMR 112 +/- 104 MJ (range -53 to 273), delta TEE 243 +/- 279 MJ (range -61 to 869 MJ), and fat deposition 132 +/- 127 MJ (range -99 to 280 MJ). The mean total cost of pregnancy (cumulative TEE above baseline+energy deposited as fat and as products of conception) was 418 +/- 348 MJ (range 34-1192 MJ). This was much higher than current recommendations for incremental energy intakes. Self-recorded incremental intakes (208 +/- 272 MJ) seriously underestimated the additional costs. The variability in response emphasizes the problems in making prescriptive recommendations for individual women, because there is no way of predicting metabolic or behavioral responses to pregnancy.

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