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Dehydration during fasting increases serum lipids and lipoproteins
N R Campbell1, W Wickert, P Magner
1Department of Medicine, Faculty of Medicine, Julia McFarlane Diabetes Research Centre, University of Calgary, Alberta.
Summary
Fasting without fluid replacement significantly increases lipid levels, including total cholesterol, HDL, and LDL. Proper hydration is crucial for accurate lipid level assessments during fasting periods.
Area of Science:
- Metabolic Health
- Clinical Nutrition
- Cardiovascular Risk Factors
Background:
- Fasting is a common practice for medical tests, but hydration status can influence metabolic markers.
- Previous research has not fully elucidated the impact of dehydration during fasting on lipid profiles.
Purpose of the Study:
- To investigate the effect of dehydration during fasting on serum lipid concentrations.
- To determine if fluid restriction during fasting leads to elevated lipid levels compared to adequate hydration.
Main Methods:
- An open, prospective, randomized cross-over study involving 14 healthy subjects.
- Subjects underwent two fasting conditions: one with no fluid replacement and one with salt and water supplementation.
- Blood samples were collected post-fasting for comprehensive lipid and apolipoprotein analysis.
Main Results:
- Fasting without fluid replacement significantly increased total serum cholesterol (8.1%), HDL cholesterol (7.5%), LDL cholesterol (10.5%), apolipoprotein A-1 (8.9%), and apolipoprotein B (10.5%).
- Serum triglyceride levels did not show a statistically significant change.
- Body weight reduction was greater during fluid restriction fasting (1.8%).
Conclusions:
- Dehydration during fasting significantly elevates key lipid parameters, potentially affecting cardiovascular risk assessment.
- Maintaining a standard state of hydration is essential for reliable lipid level measurements.
- Recommendations include limiting fasting to 12 hours and ensuring adequate water intake while avoiding diuretics and strenuous activity.