HUMAN NUTRITION

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: -Fats typically provide more than half of the body’s energy needs. Fats from food get broken down into fatty acids, which travel in the blood to energy-hungry cells. Fatty acids that aren’t needed right away are packaged in bundles called triglycerides and stored in fat cells, which have unlimited capacity.

Detailed explanation-3: -Protein takes the most energy to digest (20-30% of total calories in protein eaten go to digesting it). Next is carbohydrates (5-10%) and then fats (0-3%).