Very sensitive I'd say! I don't think I've ever been able to take insulin 10 mins before eating and not see a significant rise with "normal" carbs!I think we all react differentlyI can get away with a 10 minute bolus any time except breakfast. if I ate it first thing, I'd probably get worse results.
I am sensitive to insulin though. I use porcine usually and save the Humalog for something like a Krispy Kreme or similar, or when I need to get my BS down fast eg for a correction.