Very rarely do I get restaurant meals right when they involve a lot of food. I seem to either overdose and then go low. Or I underdose and go high. Or I seem to do OK in the short-run and then go sky high later because of the the absolute quantity of the food taking longer to digest and the probably high-fat content taking longer to digest.
I do have a couple of fast-food meals that I can do great on, but they’re relatively healthy choices and not super high-carb. My most reliable fast food meal is at Wendy’s: a small chili, a side salad with a spicy ranch dressing, and a diet coke. I dose for 24 carbs, either all at once if my BG is normal, and a dual wave if my BG is somewhat low before eating. That’s not a ton of food, but it’s great for me on my workdays.
Like most everyone, I like to have fast corrections but in reality, they don’t work well for me. So I do my best to stop those high numbers from happening. If I take enough insulin to bring down a high quickly, then there is no doubt that I’ll go low later unless I snack a lot. For me there is no doubt that I have noticeable insulin action for 4 hours after a bolus, so I can’t take huge doses without repercussions. It also takes me so much more insulin to bring down a high than it does to prevent one.
I don’t worry about the speed of bring down highs. I think that for people who have been chronically high, there is the belief that bringing the average BG down too quickly can impact the eyes. I don’t think that applies to random post-meal highs.