Honestly, pre surgery my doctor wanted me to have three protein shakes a day and water....all of 330 calories. I tried it his way for two days. I had a soaring headache for two days. My blood pressure shot up to 220. It was crazy. I have never had blood pressure problems. I went back and said we have to do something different. He said drink some crystal light to curb the hunger. Yea, that didn't work. So I tried something different, I had a protein shake every three hours , 7am 10am 1pm 4pm 7pm and 10pm. I drunk water in between. No food. IT WORKED. No more headaches no more pain. Only 660 calories a day. I still loss weight. What I discovered from all of this. My stomach could not be empty. Water and shakes consistently. I still eat like this post band. Losing weight. Small cupful of food, every three to four hours. MAYBE, you are the same way. Everyone can not make it on an empty stomach. However, you can change what you put on it. And if you eat/drink at regular intervals, the body wont think its starving. Most important thing, you are not a bad person and you made a good decision. I too cannot exercise until August - need time to heal first.