What should blood sugar be one hour after eating?

So as to have something consistent to work to the usual tests are done just before starting to eat and again two hours after that. It seems to give a good indication of how the meal is being dealt with, and if the meal is too high in carbs in the first place. A difference of two whole numbers, if measuring in mmol/l is good, which is a difference of - I believe 36 in other units.
I think that by A1c you mean the Hba1c test - which shows the average level of blood glucose, but it doesn't differentiate between a fairly steady level of blood glucose and one where levels are up and down all the time.

It will affect it but only as part of the average as that's pretty much what the hba1c measures.

Pretty much all food with a bit of carbs in will change your blood sugar. The reason for testing is more to know which food to avoid in the future to keep it steady. So rice, for instance, definitely out for me as a few bits if sushi pushed me right up. I wont worry too much if my bs goes up but I know to avoid it next time. It's a bit like a food elimination diet for intolerances.

I don't do this perfectly as this christmas has shown!!

113 after 2 hours is pretty good. Since you dropped to such a nice level you might have been normal in another 15 minutes that would still be good. Fat can slow down carbs being metabolized and even insulin working as fast and it was a slightly higher carb meal.

Even normal people have a little higher spike after eating higher carbs at the hour point, so testing in an hour really doesn't mean much.

https://www.diabetes.co.uk/diabetes_care/blood-sugar-level-ranges.html
https://www.diabeteschart.org/mgmmol.html

Stefmjxo said:

I can't find any information anywhere on this

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You might like to read this article by Jenny Ruhl:
https://www.bloodsugar101.com/healthy-blood-sugar-targets
She is T2, has written several useful books on T2 diabetes, and has survived to be over 70 without suffering major complications, which suggests her well-researched advice is likely to be good.

I am assuming you are Type 2. Firstly I would work towards a "safe list" of foods / meals, by testing before and at 30 minute intervals up to 3 hours (your health is worth the initial expense). The 30 minute I think is important due to seeing what for example a banana does to otherwise healthy younger people, and this 2 hour mark hiding the spike.

Once you have the list of meals that work then I would revert to fasting blood glucose and 2 hour tests.

My "safe list" is varied and complete, and produces fbg's between 3.9 and 4.4 and post prandial readings never above 6.0. I know my after fbg and moving around increases bg to around 4.8 to 5.0. I know that mainly carnivory reduces fbg by around 0.3 mmol and that heavy exercise (above my normal) results in an up to 0.5 drop (once got a fbg of 3.3 on my heaviest ever session the day before). I really do advocate building a picture of how you individually react.