Fueling for the Long Haul: What to Eat During a 100 Mile Run
                                
                                
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                                    4 min read                                
                            
                                According to the International Society of Sports Nutrition, a single-stage ultramarathon may induce an energy deficit of over 7,000 calories, underscoring the critical need for proper fueling. Understanding what to eat during a 100 mile run is the key to managing this massive energy expenditure, mitigating gastrointestinal distress, and sustaining peak performance for the long haul.