Nutrition and Nutrients : Which nutrient is the primary source of energy for the body?

Carbohydrates are the body’s main energy source, providing 4 kcal per gram. They break down into glucose, which fuels cellular activities. Complex carbs (starches, fiber) provide sustained energy, while simple carbs (sugars) give quick bursts. Inadequate carbohydrate intake forces the body to use protein and fat for energy, which can impair muscle function and metabolic processes.