I spent the 1st week sipping water to get my 64 oz in, stopping 30 minutes before & after my 1/2 protein shake 4 times throughout the day. It took at least 1/2 hour to drink the half carton, so although I wasn't hungry, I was eating & drinking on a schedule. I wrote my times down, and also tracked my meds. I didn't start feeling any real hunger until recently, about 4 months past my surgery. Good luck.I’m only one day 2 since my surgery and am having a hard time knowing when I’m hungry. How did you handle the first few days after surgery