So can fat cause spikes even with no carbs in the meal? Kayla was 94 and decided to eat a couple of hot dogs with no buns for dinner while the rest of us were out at baseball. I see that she did have ketchup and mustard so there would be some carbs there but not even enough to take 1 unit with her I:C of 1:20. So here it is 2 hours later and she is 213. Was it just the fat in the hot dogs?