Day 1 I was fine. But day 2 & 3 I had mental hunger. I talked myself out of eating fish both nights. I figured if I was going to eat something I would be protein and good for me. Never ate it though and I'm so glad. I had to stay away from the kitchen those evenings. Now I'm on day 7 and I have yet to even start drinking my shakes today. I am drinking so much tap water, I'm not hungry. Be strong, it will be worth it. I haven't done any SF pudding, popsicles, jello etc but all are allowed as snacks. Just shakes, protein water and water for me. You can do it but head hunger is a b*tch!!!