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How do you lose 18lbs in 4 days without exercise?

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ok hi everyone, I am about 12.4 lbs and about 80kg I have resently started doing this nutritional diet which makes me replace two meals with two shakes. the first two weeks were great I lost some inches going from 13lbs to 12.3 but now everything is crashing down and am going up in weight again please tell me anyone how I can loose weight for my prom night.