NEET BIOLOGY

Detailed explanation-1: -Fats are the slowest source of energy but the most energy-efficient form of food. Each gram of fat supplies the body with about 9 calories, more than twice that supplied by proteins or carbohydrates. Because fats are such an efficient form of energy, the body stores any excess energy as fat.

Detailed explanation-2: -Most of the energy required by the human body is provided by carbohydrates and lipids; in fact, 30-70% of the energy used during rest comes from fat. As discussed previously, glucose is stored in the body as glycogen. While glycogen provides a ready source of energy, lipids primarily function as an energy reserve.

Detailed explanation-3: -Fat. Intravenous lipids have the highest caloric density of the three major nutrients (9 kcal/g). In general, intravenous lipids should comprise between 30% to 50% of all non-nitrogen calories. Lipids have the advantage of being an excellent source of energy and essential fatty acids (EFAs).