Hydration can impact pregnancy and birth outcomes
Water needs increase during pregnancy, and proper hydration is critical for maternal and fetal health. A Penn State study recently examined the hydration status of pregnant women, the impact of a behavioral intervention, and tested how underhydration during pregnancy was associated with birth outcomes.

The Healthy Mom Zone Study is a longitudinal, randomized-control trial intervention aiming to regulate gestational weight gain (GWG) in pregnant women with overweight/obesity. Fourteen women received standard of care; 13 women additionally received weekly guidance on nutrition, physical activity, water intake, and health-promoting behaviors. Hydration status was measured weekly via overnight urine osmolality (Uosm) from ~ 8–36 weeks gestation; underhydration was dichotomized.

- No differences existed in Uosm or other characteristics between control and intervention women at baseline.

- Significant interactions between intervention and week of pregnancy on Uosm indicated intervention women maintained lower Uosm, whereas control women had a significant quadratic relationship and greater Uosm in the second and early third trimesters.

- Results were consistent across robustness and sensitivity checks. Exploratory analyses suggest underhydration was associated with birth weight, but not length, in opposite ways in the second vs. third trimester.

In particular, a multi-component behavioral intervention helped women with overweight/obesity maintain better hydration throughout pregnancy.

European Journal of Nutrition
Source: https://doi.org/10.1007/s00394-021-02616-x
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