How many calories are in a lb?
                                
                                
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                                    4 min read                                
                            
                                The widely cited figure of 3,500 calories to lose one pound of fat originates from a 1958 calculation by researcher Max Wishnofsky. This article explains why that number is not a precise guide for modern weight loss, detailing the complex science behind body fat composition and the factors that influence calorie burn.