Which body part needs water the most? The Critical Role of the Brain and Kidneys
                                
                                
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                                    3 min read                                
                            
                                The human brain is composed of approximately 75-85% water, underscoring why proper hydration is not just a suggestion but a critical necessity for cognitive function. While all organs need water to survive, the question of which body part needs water the most is best answered by looking at which are most sensitive to its lack. While organs like the lungs also have a high water content, the brain and kidneys are arguably the most critically and immediately impacted by insufficient water intake.