Have you started your preop yet? I start tomorrow, but quit soft drinks over a month ago and have just been drinking Water, water with Mio, a glass of sweet tea ever few days. I have had no caffine except what is in the occasional sweet tea. I have already started a couple of shakes a day and eating at supper time. Trying to make my transition as painless as possible. I cannot imagine doing this with a caffine withdrawal headache! There is so much info out here.....even more than my surgeon gave me. Not knowing what to ask, I have read so many posts, I now have questions for him! I've researched and researched for months now and I am ready to be sleeved!!! Preop tomorrow and surgery on the 29th!