What is the most fattening burger? A calorie breakdown
                                
                                
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                                    4 min read                                
                            
                                According to Guinness World Records, the world's most calorific commercially available burger packs an incredible 9,982 calories. But outside of a record-breaking challenge, what is the most fattening burger you might actually find at a restaurant? The answer depends on your definition of 'fattening' and which popular chain you visit, as many fast-food giants offer menu items loaded with excessive calories, fat, and sodium.