There is no universal answer or specific guidelines on when a sugar level is too high after meals. However, if post-meal readings are consistently above your target range (or the recommendations from ISPAD 5mmol/L to 10mmol/L), then you should discuss whether it would be beneficial for you to address these spikes and how to do this, with your healthcare team (see below for some suggestions for your discussion).
If you are reviewing your post-breakfast sugar levels, you should also be aware of changes in your hormones in the morning, which cause increases in sugar levels (this is known as the dawn phenomenon). This Digibete video may help.
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