Depends what your "goal" is

If you want to protect against all Diabetic Complications then as Henry notes 7.8 mmols/140 is as far as you should go

If you are trying to protect your Kidney's (kidney disease), Eyes (retinopathy) and Brain (dementia) then the max is 8.7 mmols/154

If you are looking to buy yourself 10 years before the complications really start to take hold then you can go with the under 10.0 mmols/180 which is the national (standard)

Why is the standard so high that it means you will still get complications "in a decade"?

Because 70% of Type 2 Diabetics have "no control" of their blood sugar so it's the best many can hope for

Actually, at 2 hours after your 1st bite your number should be no higher than 7.8 (140 usa).

Any higher and you are adding to the cumulative damage to our vascular systems from glucose spikes.

This cumulative vascular damage feed diabetes complications and comorbidities. I like having toes, feet and legs. I like having functional kidneys. Dialysis sucks.

It's your life and your choice.