Do You Need Carbs or Protein for Gym Performance and Muscle Growth?
                                
                                
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                                    5 min read                                
                            
                                According to the International Society of Sports Nutrition, glycogen from carbohydrates is your muscles' main energy source for high-intensity exercise. Yet, protein is universally known as the building block for muscle repair and growth. So, do you need carbs or protein for gym success? The answer is more complex than a simple either/or choice.