In a 1-3 day fast, you are losing water weight... you are also ridding yourself of toxins, but yes, it does screw with your metabolism... you should never do a fast for weight loss, as the weight will come back, but to rid your body of toxins and to do a cleanse, a fast is not a terrible thing....
When you fast or juice fast for 1-3 days, does it mess w/metabolism? Water weight? 
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