@W1w1

     Nutritional MythBuster  #27
W0w0 P l Qd


MYTH: Exercise makes one lose weight.


TRUTH: Guyton, in 4Textbook of Medical Physiology5, gives the Calorie
expenditures of various levels of activity as:

    Activity                             Calories per hour

    Sleeping                                     65
    Awake lying still                            77
    Sitting at rest                             100
    Standing relaxed                            105
    Dressing/undressing                         118
    Typing rapidly                              140
    "Light" exercise                            170
    Walking slowly (2.6 miles per hour)         200
    Carpentry, industrial painting              240
    "Active" exercise                           290
    "Severe" exercise                           450
    Sawing wood                                 480
    Swimming                                    500
    Running (5.3 miles per hour)                570
    "Very severe" exercise                      600
    Walking very fast (5.3 miles per hour)      650
    Walking up stairs                          1100

    If we take our normal daily activity as equivalent to typing, the 
increase in activity for running is 570 - 140 = 430 Calories per hour. 
Since animal "fat" has about 3500 Calories per pound, one would have to 
run for 3500/430 = 8.1 hours to "burn off" a pound of fat.

    So, to "burn off" a pound of "fat", one would have to RUN 5.3 miles/hr 
x 8.1 hr = 43 MILES!!

    Conclusion: one CAN NOT lose weight by exercise.  That is why we 
see overweight aerobics instructors.







(C) 1991 LJForti