is blood testing a waste of time
There are many reasons for testing and recording BG levels for as T2.
The ones that you will get most information from are the pre meal and two hours after first bite.
This will give you, your intolerance to what is in that meal.
It provides a degree of how to avoid such foods.
Or as the case may be, what is ok to have.
It can also give you the insight of a trend towards good control. Or, if not.
It can help with meds to see if they are working either with or against you average BG levels at that stage of your journey.
There is also fasting BG levels. This can help with knowing how your BG levels are doing with your dietary control. Or if you are taking meds.
There is also finding your spike usually around the half hour to an an hour after food.
Again to monitor how the intolerance to that meal/food is having an effect.
There is again depending on what you are trying to find out, hourly testing after food or after meds. Three and four hours may give you info about how you are doing, recovering after a high, longer spike than usual.
There is again, a spot check, if you feel a sugar crash or feeling awful, if meds are going towards hypoglycaemia.
A CGM can do all this, if you know what you are looking for.
And I would always recommend a food diary to augment the readings, as to show your doctor, dsn, endo, to show the control the testing has given.
Testing is so important, if it used properly.