Understanding Which Nutrient is the Slowest Source of Energy
                                
                                
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                                    3 min read                                
                            
                                A single gram of fat provides about 9 calories, more than double the energy supplied by a gram of protein or carbohydrates. However, despite being the most calorie-dense macronutrient, fat is the body's slowest source of energy due to its complex metabolic pathway.