I. Food as Fuel
The energy content of food is measured in calories
The energy content of:
- Fat=9 kcal/ 1 gram
- Protein= 4 kcal/1 gram
- Carbohydrates= 4 kcal/1 gram
Several processes must occur continually in higher anmals alive, for example, breathing and heart beating. The number of kcal a resting animal needs at a given time is called a basal metabolism rate, or BMR