Gastric Bypass = starvation mode???

Hello NG.Now something has been confusing me lately,and I wasn't sure
where to get an answer except for here,where alot of ppl contribute
their suggestions.Now i was wondering,since gastric bypass surgery
shrinks the stomach so there is small space for food,the person eating
will not be able to get in alot of calories.I know alot of people who
have done it and have lost a ton of weight,from 100lbs and up,who look
fantastic.I asked a few of them how many calories they consume
daily,and they have told me about 800-1000.Now since this is such a
low amount of calories,wouldnt the person go in starvation mode and
lose a tremendous amount of muscle? Also,wouldnt they feel really
weak,and how would they stand living in these conditions? What
surprised me is that the people who have done it told me they felt
really great,and not really that much weaker,even though eating a
couple of teaspoons of something makes them full.So is there something
I'm missing that this surgery does that I am not aware of.I mean i can
control how many calories i consume,if i wanted to eat 500 calories
throughout the day,I can control myself to do it,even though i will be
very hungry,i can pull it off,but I have always been told that that's
not the way.So what I'm trying to get to is that,if a person only
consumed the amount of calories that a person consumed having the
surgery done,would the results be the same? And the people who did the
surgery,wouldn't they have lost a ton of muscle? I mean the end result
is amazing,I have seen many people who were very obese who have gone
down to regular size for their age.I eat around 1700 calories a
day,feeling full and full of energy,thats because i use xenadrine
efx,which provides me with the extra kick,i mean it works for me,when
i dont take it i feel the difference,i also take TLN by prolab which
is for people consuming a small amount of calories,what it does is let
your metabolism NOT slow down,which i think works.I burn about 700-800
calories doing my daily excercise(half hour cardio+1hr and a half
heavy weight training).I also take creatine after my workout,and i get
my protein from protein powder.I have never felt better,I have been
doing this for a week only,and I have never slept better.Even though
my net calories is 1000 or less.Even after I'm done my workouts,which
is a total of 2 hours or more,i still feel like excercising more,or
playing some sports because the amount of energy left in me is
tremendous.After this week is done,I have noticed that I have not lost
a pound,or any inches,BUT i feel my muscles are puffed out alot,and
they feel more full.Now what I want to know is if my routine is
acceptable? Am i doing anything wrong? Should i continue this way
instead of turning to some kind of surgeries such as the gastric
bypass surgery?Sorry for the long post,but this is something that has
been going through my mind lately,and I would like some answers.Thank
you so much for taking the time reading my concerns,god bless you
all,and i'd like to make an online toast to everyones health.Bye!