What is the difference between metabolism and metabolic rate?
Metabolic rate is one aspect of the whole metabolic process.
Metabolism is the well-known biological process to maintain life: get energy, its conversion to the macromolecules basic units and excretion. It's divided into anabolism and catabolism.
The metabolic rate concerns the speed or frequency of metabolism.
It affects the potential lifespan as it influences how much food (energy income) an organism will require to keep its functions active.
Basal metabolic rate ( BMR ) is the lesser spent energy per time (at rest).