pre-op
it depends on why they put you on the diet. i had to go on a diet to lose 20lbs. i lost 10 and then gained it back and everything was fine. the risk for me was to have an open rny instead of laproscopic. will he do it if you dont do as good? i wish i could help or give good advice but i didnt follow it myself. if i knew surgery would be cancelled i would have done better.
good luck to you. i will keep you in my thoughts.
LaDonna