I am one week into my pre-op diet. My doctor did not require me to do a liquid diet. I am allowed chicken and turkey breast no skin, lean cuts of deli meat, tuna, unlimited protein shakes, egg whites, sugar free jello, sugar free pudding and sugar free popsicles but absolutely no fruits or vegetables. I am down 8 pounds in one week. It is a challenge with the few choices that I have so I am certain all liquids are tough.