I'm type 1 and haven't got any problems at all with caffeine, I drink a lot of coffee. A friend of mine developed a totally carb-free one called ubershot. It's got something in it that is officially a carbohydrate in scientific terms but it does not convert itself into useable carbs in the body, so it is legally counted as a zero-carb product. You can google it, you can get it delivered with your weekly shop with one supermarket or buy directly from the suppliers. They do indeed have a lot of caffeine in them, and my friend doesn't advise me to have coffee around the time I drink it. It's a tiny little shot and not for mixing with vodka. If you're having sugar-free red bull I don't see the problem but you do have to be conscious not to have too many as too much caffeine can cause anyone, diabetic or not, to have some problems. The ones I'm talking about are called energy shots, 58mls, they do exactly what they say on the tin. If you're having red bull with sugar with your vodka, it might be working out ok for you simply because the vodka will drop your sugars eventually anyway, so the sugar's helpful. I wouldn't have too many in a row myself, but if you're out dancing and stuff maybe it's all good because you need the carbs under those circumstances, but still, the caffeine can cause probs for some people.