Water also leaves through sweat, through our breath, like when you breathe on a cold surface and see condensate, and a bit through runny nose and tears. Additional water is produced from chemical breakdown of dry food.
If you hadn’t consumed water for several days of dry fasting, you might not urinate after drinking a few liters because the body is absorbing it. But after it is “full,” the water has nowhere to go but out through all these channels.
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