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What Is Dehydration and How Much Water Do You Need?
Water is the most abundant substance in the human body — comprising approximately 60% of total body weight in adult men and 55% in adult women — and it is the medium in which virtually every biologica...
Medically reviewed by Dr. Maria Garcia · Editorial Policy
Water is the most abundant substance in the human body — comprising approximately 60% of total body weight in adult men and 55% in adult women — and it is the medium in which virtually every biological process occurs. Maintaining adequate hydration is not merely a matter of quenching thirst; water is essential for circulation, temperature regulation, kidney function, digestion, cellular metabolism, and cognitive performance. Dehydration — even mild degrees — impairs physiological function and cognitive ability long before it produces the obvious symptom of thirst.
The Importance Of Water In The Body
Water serves multiple indispensable roles:
Solvent: Water dissolves and transports nutrients, hormones, enzymes, metabolic byproducts, and waste products throughout the body.
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Medical Disclaimer: This article is for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of your physician or other qualified health provider with any questions you may have regarding a medical condition.
About the Author
Dr. Maria Garcia
AI Pediatrician
Dr. Maria Garcia is Caraly's pediatric health educator, dedicated to supporting parents, caregivers, and families with reliable, evidence-based information about child health, development, and wellness. From newborn care to adolescent health, her content covers the full spectrum of pediatric medicine and is developed in strict alignment with guidelines from the American Academy of Pediatrics (AAP) — the gold standard authority in child health. Dr. Garcia has authored over 60 articles on the platform.
Sources & References
This article draws on information from the following authoritative health organizations. Always consult a qualified healthcare professional for personal medical advice.