If you stop taking in fluids, you will begin to dehydrate. You will weigh less than you did, but you haven't lost any fat, you've only lost some water (your cells are low on moisture). When you finally take in some fluid (and you have to or you will die), the weight will come right back as your cells rehydrate. Think of your body as a damp sponge, it weighs less as it dries out.
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