How many calories a day do Olympic runners eat? The science of fueling elite performance
                                
                                
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                                    3 min read                                
                            
                                Elite marathon runners may consume anywhere from 3,000 to 8,000 calories daily to meet the extreme demands of their training regimens. This incredible intake is essential to understand exactly **how many calories a day do Olympic runners eat** and why their dietary needs differ so vastly from the average person.