Understanding How Many Cups of Water Is Too Much at Once?
                                
                                
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                                    4 min read                                
                            
                                The kidneys of a healthy adult can process approximately 0.8 to 1.0 liters (about 3.4 to 4.2 cups) of water per hour. Consuming water much faster than this can overwhelm the body's systems, leading to a potentially serious condition known as water intoxication or hyponatremia.