HUMAN NUTRITION

Detailed explanation-1: -Organisms use lipids to store energy. There are two types of fatty acids: saturated fatty acids and unsaturated fatty acids. Animals use saturated fatty acids to store energy. Plants use unsaturated fatty acids to store energy.

Detailed explanation-2: -All types of fat are high in energy. A gram of fat, whether it’s saturated or unsaturated, provides 9kcal (37kJ) of energy compared with 4kcal (17kJ) for carbohydrate and protein.

Detailed explanation-3: -In cellular metabolism hydrogen-carbon bonds are broken down-or oxidized-to produce energy, thus an unsaturated fat molecule contains somewhat less energy (i.e fewer calories) than a comparable sized saturated fat.

Detailed explanation-4: -Triglycerides are the primary form of long-term energy storage in plants and animals. Fatty acids are long chains of 12 to 24 hydrocarbons with a carboxyl group at the end. Bonding within fatty acid chains gives fats and oils their characteristics.