Fluid Intake Restriction Concomitant to Sweetened Beverages Hydration Induce Kidney Damage

Area of Science:

• Nephrology
• Metabolic Health
• Nutritional Science

Background:

• Paradoxical low water intake alongside high sugar-sweetened beverage (SB) consumption is prevalent.
• These habits correlate with increased metabolic derangements and chronic disease mortality.
• Heat dehydration and SB intake stimulate vasopressin release and polyol-fructokinase pathway, mediated by oxidative stress.

Purpose of the Study:

• To investigate if water restriction combined with SB hydration induces renal damage.
• To evaluate the role of vasopressin and oxidative stress in this process.
• To compare the effects of water, SB, and stevia hydration under fluid restriction.

Main Methods:

• Male Wistar rats were fluid restricted for 4 weeks.
• Groups rehydrated with tap water (W), SB (11% fructose-glucose), or stevia (ST).
• Renal damage markers, receptor expression, pathway activation, and oxidative stress were assessed.

Main Results:

• Fluid restriction with water mildly increased urine osmolality and tubular damage markers (NAG, KIM-1).
• SB hydration significantly amplified these changes, alongside V1a/V2 receptor overexpression, pathway activation, and oxidative stress.
• Stevia hydration showed effects similar to water hydration.

Conclusions:

• Current hydration habits, particularly SB consumption during fluid restriction, may be a risk factor for kidney damage.
• SB intake exacerbates dehydration-induced renal alterations.
• Stevia presents a potentially safer alternative to SB for hydration.