I have a completely different situation. No liquid diet for preop. I lost the weight by downloading an app on my smart phone called calorie counter. It was free and I maintained a 1200-1500 calorie diet. I can't do much exercise because of plantar faciatis but my lower calorie intake has helped me lose about 30 lbs. I'm 6 days away from my surgery and I'm really struggling with this diet. I've struggle d with the thought of surgery since I was losing on my own, however, I'm feeling like I usually do every time I go on a diet. I know I need this surgery to help me make this life change. Hope this helps.