LIFE SCIENCE

Detailed explanation-1: -Carbohydrates, fat and protein are called macronutrients. They are the nutrients you use in the largest amounts.

Detailed explanation-2: -Carbohydrates are the primary (number one) source of energy for our bodies. With enough carbohydrates, the protein and fat that we eat can do their jobs.

Detailed explanation-3: -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.