Nutrition Diet: How Much Fuel to Run a Marathon?
                                
                                
                                •
                                
                                
                        
                                    
                                    5 min read                                
                            
                                Glycogen stores, the body's primary carbohydrate fuel, can power a runner for only 90 to 120 minutes of high-intensity effort before depletion sets in. Understanding precisely how much fuel to run a marathon is critical to avoiding this infamous 'wall' and finishing strong.