What is 4.2 kcal energy? Understanding Kilocalories and Nutrition
                                
                                
                                •
                                
                                
                        
                                    
                                    3 min read                                
                            
                                Approximately one gram of carbohydrate releases 4.2 kcal of energy when metabolized, making this a fundamental value in nutritional science. This metric helps us understand what is 4.2 kcal energy in the context of food and how the body uses it for fuel.