It seems like a lot of people employ low carb diets or eat routinely under the same threshold of carbs each meal for tight control. I can certainly see the merits of each approach and there could be a lot of reasons for each. But that also makes it seem like I:C ratios aren’t really employed in those scenarios. Eating the same amount of carbs each meal would seem to indicate that the I:C ratio is not scaleable…which would mean it’s not a ratio at all. And I’m talking about it outside of the obvious point that there are a ton of variables that influence how much insulin you need under different circumstances.
I, personally, have my own current comfort zones for how much insulin I feel comfortable doing a full pre-bolus with. I used to be comfortable taking 11+ units at a full pre-bolus. But that was also when I was in complete control of my schedule and my amount of physical activity. I am in full control of neither of those things in this phase of my life. These days, I feel comfortable doing a full length pre-bolus with 7 units because I feel like if it starts to gain momentum sooner than expected, I can catch it pretty easily. So in that sense, I could see sticking to a carb limit per meal that jives with 7 units just for that comfort level. But it does make it seem like it’s more of a “how much insulin do I want in my system?” vs. a “how much insulin do I need for this meal right now?” strategy. Tail’s kind of wagging the dog for me right now.
The other thing, which I’ve mentioned elsewhere, is that I really think it would be nearly impossible for me to come up with any foolproof equation for handling breakfast. Today was a total disaster…and I did the same strategy as yesterday which was not a total disaster. But either way, I never even used to eat breakfast before I was diabetic. And then people told me I should. So I did. And then they told me I needed to eat more at breakfast to get more calories, so I did. But I gotta say, carbs plus “feet on the floor” phenomenon equal a total trainwreck going into lunch…which means too much IOB from corrections that may or may not take root, which means nerves about fully pre-bolusing for lunch. I gotta get mornings under control or else the rest of my days are going to continue to be shot.