Effects of a 14-Day Hydration Intervention on Individuals with Habitually Low Fluid Intake
Aaron R Caldwell1, Megan E Rosa-Caldwell1, Carson Keeter2
1Exercise Science Research Center, University of Arkansas-Fayetteville, Fayetteville, Arkansas, USA.
Annals of Nutrition & Metabolism
|March 29, 2021
Summary
Increasing total water intake (TWI) in individuals with low TWI improves hydration markers but does not change total body water (TBW) or blood volume (BV). This study suggests benefits of increased TWI are not linked to TBW alterations.
Area of Science:
- Physiology
- Human Hydration
- Fluid Balance
Background:
- Debate exists on whether low total water intake (TWI) leads to chronic fluid deficits.
- Previous studies showed no change in total body water (TBW) with increased TWI, but blood volume (BV) changes were unmeasured.
Purpose of the Study:
- To identify individuals with low TWI and assess if increasing TWI for 14 days alters TBW or BV.
Main Methods:
- Screened 889 adults for low TWI and high urine osmolality.
- 15 participants increased TWI, 8 served as controls.
- Measured TBW via deuterium oxide and BV via CO-rebreathe procedure over 14 days.
Main Results:
- Experimental group showed decreased urine osmolality and increased urine volume.
- No significant changes in TBW or BV were observed in either group.
- Control group showed no differences in urine osmolality or volume.
Conclusions:
- Increasing TWI in habitually low consumers improves hydration markers (urine volume, osmolality).
- This intervention did not lead to measurable changes in TBW or BV.
- Benefits of increased TWI may not be directly related to alterations in TBW.
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