I.   Daily energy expenditure

     A.   resting metabolic rate   RMR
          1.   it's the largest component for most people
               a.   except athletes
          2.   it's the amount of energy expended while resting
               quietly in a comfortable environment, measured
               several hours after a meal or exercise

     B.   basal metabolic rate   BMR
          1.   same as RMR except it's measured in the morning

     C.   thermic effect of physical activity
          1.   second largest energy expenditure
          2.   it's the energy expended for muscle work
          3.   including:
               a.   occupational activities
               b.   leisure time  
                    (1)  formal   -  exercise
                    (2)  informal -  wash car

     D.   thermic effect of food
          1.   the energy above RMR that occurs for several hours
               after a meal
               a.   includes transportation, storage and digestion
          2.   protein > carbo > fat
          3.   accounts for about 10% of total energy

     E.   adaptive thermogenesis
          1.   environmental factors
               a.   cold
               b.   overfeeding
          2.   brown fat is related to this
               a.   it may have more mitochondria