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Well, one gallon of water equals 8.34 pounds, so yes, if you drank one gallon of water you would immediately gain 8.34 pounds of weight. Most of those 8.34 pounds would end up as urine though, assuming you are not seriously dehydrated.
So the weight gain would only be temporary.
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Fran
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JudyNo, you would not gain 8 pounds from drinking a gallon of water. One gallon of water weighs roughly 8.34 pounds, but your body metabolizes and eliminates the water through urine and sweat. The temporary weight gain from drinking a gallon of water is due to the water itself and not actual fat or mass gain.
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