The main type of energy used for human nutrition comes from carbohydrates. These macronutrients are a primary source of fuel for the body, providing energy for daily activities and bodily functions. Carbohydrates are found in foods like grains, fruits, vegetables, and legumes. Once consumed, they are broken down into glucose, which is used by the body for immediate energy or stored for later use. While fats and proteins also contribute to energy consumption, carbohydrates are the most efficient and readily available source, making them a crucial component of a balanced diet.