Great answers here. I actually got the stomach flu the first few days of my pre-op diet which was hell, but in some ways, an easier way to kickstart the process. The caffeine withdrawal sucks and I actually eased into that a bit pre-op (with approval from my nutritionist). But was fully off caffeine by surgery. Listen, this is a really tough process. It’s okay to be sad and scared and depressed. Remember tho your “whys”. Why are you doing it? Because if you stick with the program, it *will* result in weight loss and will change your life for the better. Some days will suck, especially at the beginning, but you can do this!