Doctors and other authorities decided on 7 for a variety of reasons, some to do with the risk of hypo and some, I suspect, because they thought that most diabetics can achieve 7 and they don't like to make it too hard.
I usually say 5, because that is close to the average for a non-diabetic. Not much work has been done on non-diabetic blood sugars, but Bernstein quotes anecdotally that 85mg/dl is the most frequent value he's found in non-diabetic visitors to his office. 85mg/dl translates to 4.7mmol/l. I just rounded it up to 5 for convenience.
FOR MYSELF
I cannot see any point in setting a target that is higher than the normal blood glucose level of a non-diabetic. I am someone, otherwise fit and healthy, whose metabolism doesn't work quite correctly if I eat carbs, I am NOT some poor sick thing called a "DIabetic", who cannot be asked to restrict the diet in case it's too much for me to handle.
We know that even people not diagnosed as diabetic, whose blood glucose tends to run "high", tend to evelop thos problems usually thought of as "diabetic complications.
Bernstein believes that pretty well ALL diabetics can learn to control BG to non-diabetic levels. In fact he calls the alternatives" uncontrolled".
PS
Of course that doesn't chime with the "Diabetics can eat anything they like " message.and "just take some more medication to cover it."
PS
I just noticed this is in type 1 diabetes. I only look for New Posts
That doesn't change what I've written. Bernstein is a T1 diabetic and has been for about 50 years.