Fat is a family of chemical compounds stored by plants and animals as a source of energy. Grease is animal fat that has been melted and then allowed to cool to a soft solid. Fat has both primary and secondary uses in Aboriginal cultures. Fat is a concentrated source of energy.
Adequate fat is essential for both energy and insulation in cold climates.
This is true for both people and the animals they rely on for food. Fats also make certain vitamins available for use in the body, cushion vital organs, make up part of all body cells and help maintain body temperature. Fat that is not immediately used is stored in the body and can be used later. Most fat is white. Brown fat occurs in many young animals and adult mammals.