[ELI5] what is water weight? Why is it the first thing you lose?
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The human body is like 60% water by weight, and the difference between being well hydrated and dehydrated is like 5 lbs. So, you can easily lose “water weight” by exercising hard without proper hydration. You really do lose weight if you get on a scale, but it’s highly impermanent because you’ll get the weight back as soon as you drink enough water.
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