In a message dated 97-07-04 04:16:26 EDT, you write:

<< I have recently read that in order to burn fat, your system clicks in
 after 30 minutes--so, optimally, you have to walk or exercise more
 than 30 minutes at a time.  While less than 30 minutes is good for
 cardiovascular, endurance, etc., you have to go beyond the 30 minute
 point to do any good for fat reduction.  I have been walking 3 miles,
 (40-45 minutes), 5 days a week, on Weight Watchers since January and
 have lost 15 pounds.  So, it *is* do-able .... but it's not very
 pleasant. >>

I have also found that my weight is far more manageable when I work out as
hard as possible (which is hard when one is hypo) as well as longer.  When I
decrease  duration  at the expense of intensity, I gain weight.
 Unfortunately, I have to invest time and intensity in a hard workout.  As
you say, however, it is possible to manage weight with this approach.

ZeeSwan