I'm soooo hungry!
I don't think that the amounts are right. There is no way that you can sustain yourself on those amount preop. With the surgery, the digestion/absorption is restricted and takes much longer. Your body must go through those amounts in 10 minutes. Definitely check with the dr. about the amounts. It seems that he wants you to get used to the types of diet that you will have right after the surgery. Let us know how you are doing and what he/she says.
Best of luck!
Melissa