After researching it, I haven't found where carbonation stretches your stomach. I like energy drinks. I don't have to have a soda. I work at night and I used to drink half of one. (I work one night a week). I don't ever drink the whole. I know that this is totally loaded with sugar so this is why I am undecisive about it. Since before and after surgery, I have been pretty much sticking to the sugar free or at least as little as I can. I am going to work tonight for the first time in 10weeks and I want one. I am going to have one and let it water down. I am sure that I cannot have even half now without the effects of feeling jittery. I don't feel bad because we had surgery and made a lifetime change. We did not sign a death certificate or one where we should not experience the things that make us happy. We should treat ourselves sometimes within moderation. Like my doc says, you have to see what works with your body. You choose because only you have to live with consequences.