Melafw, I had the same problem (surgery tomorrow). I couldn't stay on/stuck to just liquid diet... I ended up calling my doctor and he said I can replace my diet with a Protein bar (switch from 4 Protein drinks to 3), plus 1 salad.
Mainly they just wanted me to lose about 10 lbs. and get ready for post-op diet.
Call your doctor and discuss your concerns.
Bottom line is: "DO NOT CHEAT 2 says prior to surgery -
DO NOT CHEAT during post-op (you can end up in ER)." That's what my doctor tells me!
You can do this - best of luck!
Sent from my SM-N910T using the BariatricPal App