Katherine, lines/exchanges etc are all the same (personally I changed years ago to just calculating by actual grams of carbohydrate, I find it simpler), but I found DAFNE to be much more than that. It goes deeper into helping you work out the ratio of how much insulin you need for how many carbs or to lower your BG by a set amount. Looking at how you deal with different things like exercise, eating out, sickness, alcohol etc. The concept is the same as the old lines way of working, but I found the teaching to be far more indepth which is why it can still be really useful even if you understand the basics.
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