My surgery is scheduled for 8/19 and I just started my pre-op diet on Saturday as my surgery date was just given to me on Friday. I can only have certain raw veggies, 64oz. of water & 5 Ensure High Protein drinks per day. I have to tell you, it's rough. I've only cheated twice - had two slices of turkey lunchmeat one day and half a plain, 1/4lb. hamburger (no bun, seasonings, cheese, or anything else) another day. Since Saturday morning, I've lost 4lb. but I feel miserable. I have headaches, feel lightheaded, am achy, and have had major stomach/bathroom issues. I emailed my dietician this afternoon to see if this is normal as I just feel awful. Hoping she'll let me add some more "solid" food like chicken breast. Good luck - I know it's not easy!