i have had to do pre op for 4 weeks and let me tell you the first 2 where tough and i collapsed and cheated, but i have knuckled down this last 2 with the milk diet and it is so easy now after 8 days is almost normal, i dont think of food and i am happier, not too mention 10lbs lost since friday, i am not worried about my liver as i believe that ketosis is a sign that your liver is depleted of glycogen which is the idea of the pre op and i had ketosis for the last 4 days, all i can say is knuckle down and forget the rest of the world until your op is over, i have a very busy house 5 kids and my girl, and its almost as if i am in slow motion and they are shooting around in the background, it really does feel like you are alone for the last days before surgery, no matter how much support you have, well thats how i feel anyway, so please dont worry just stick the rules and it will be over vefore you know it,