Carbohydrates: What is the main energy source for endurance exercise?
                                
                                
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                                    4 min read                                
                            
                                Research consistently shows that for events lasting longer than a few seconds, carbohydrates are the most crucial macronutrient for endurance athletes. These stored and circulating sugars are the pivotal fuel source for maintaining high intensity and delaying fatigue during prolonged physical activity.