How much can your weight go up after a big meal?
                                
                                
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                                    4 min read                                
                            
                                The average adult's weight can fluctuate by as much as 2 to 8 pounds in a single day, a phenomenon often observed after a large meal. This immediate increase on the scale is rarely, if ever, a sign of permanent fat gain but rather a collection of temporary, natural physiological changes.