Metabolic rate is a measure of how much food, or fat, is converted to energy in a day. Resting Metabolic Rate (RMR) is the measurement of how much food, or energy, is required to maintain basic body functions while you are in a state of rest. That energy is expressed in calories per day. So, an RMR test shows precisely how many calories you burn at rest in a day. With your RMR test results, and your specific goals, a specific nutrition plan can be put in place.