| Lizzie:
There's another possibility which is that you are for some reason more insulin resistant in the afternoon. You are eating 1 bagel, which should be about 50 g carbs. I don't know your numbers but with me I work on 4.5 g per 1 mmol, so with no bolus you would expect a rise of about 11 i.e. 5.7 + 11 = 16.7. Since you went to >14 this implies that your bolus had almost no effect whatsoever in the first 2 h and then worked "all at once" over the next 90 mins.
I don't want to exclude any of the other posters' ideas, just that you might consider that it is actually some sort of basal abnormality. Do you exercise at lunchtime? I see similar spike effects after a hard session in the gym.
Joel | 
