Shticky Guy
You make it sound as if there is some sort of issur in surgical weight loss. Would you consult a posek if chas v’shalom you had a heart attack and were told you need immediate bypass surgery. Would you say “Dr. please wait I just sent a shailoh to eretz yisrael” How about if the doctor suggested that you cut
down on red meat (still leaving you the option for Bosor V’Dagim on shabbos), or to lower your salt intake? Of course one can and should consult a Rov for advice but why are you looking to create an Issur?