What is considered a blood glucose spike?

[Purple_Panda]

This confuses me. What values are considered spikes and what values can BG go up to in the immediate post-eating even for normal non diabetics?

I'm worried despite great HBA1c control I am showing diabetic retinopathy indicating poor BG control so this is deeply concerning.

I've now gone back on a strict low/no carb diet but does that mean I can't have spikes way about 4-5 for fear of retinopathy effects? Really confused nobody seems to be explaining this to me well.

 

[Leadinglights]

Because an HbA1C is an average the lows can even out the highs and hide some high after meal levels, so monitoring after meal levels will give you a better idea of what foods are causing your blood glucose to increase by more than a 2-3mmol/l after 2 hours, you would hopefully keep the 2hr after meal level to be no more than 8mmol/l.