Have I caused damage.

In my opinion No as your level went right back down, it takes months and months of constant high readings to even be anywhere near causing damage .

 

I doubt you have done yourself any damage at all. You returned to normal, which is excellent. Damage is done when this happens daily over a period of time. A one-off is fine.

Because pizzas have a lot of fat in them this holds down a really high spike but the rise takes longer to drop back to normal. Pizzas can also be funny things, you may see another rise later. You can look up "pizza effect" and it will tell you better than I can because I don't eat pizza and never have done so have no personal experience.

 

You should be fine, it came down pretty quick and good on you for checking your bloods afterwards so if there isn't a really late spike and some fasting highs you'll be okay.

 

No damage whatsoever. I have one (rarely) but choose the toppings carefully (pepperoni / bacon / ham / mushrooms / cheese) and load it with triple meat servings to offset the dough and choose family size. Three meals out of it and zero impact.

EDIT - I should add that our pizza offerings in Australia are massive and varied and I''d go nowhere other than an independent

 

No that’s not a cause for concern.

However, I personally caution against reading too much into the blood measurements of others who “aren’t diabetic” given that some data suggests upwards of 50% of the population (in the US admittedly) have some level of undiagnosed metabolic dysfunction and hyperinsulinemia.

But besides that, ~8mmol/L is not likely to be causing any real harm in the short term. Whether or not it’s acceptable to the individual is a personal matter. I wouldn’t worry too much, though I also wouldn’t make a habit of it, but that is just me. Some also believe that whole body glucose is as important as the measurable “overspill” of blood glucose, but there’s no need to go into that here.