Hi arzoo, I'm presuming you're not talking about
when you test your blood sugar in the morning at home. There are two lab tests (maybe more! what do I know?) that I am familiar with: the glucose tolerance test or OGTT for which you have to fast for at least 8 hours beforehand. That test is probably better for determining if you are really diabetic because it's so controlled. When you drink a glucose solution, your blood is taken after 1 hour and then 2 hours and will show the doctor how your body metabolizes glucose. It would be hard to fool the lab on that test. The second test is the HbA1c
or simply called the A1c in which blood is taken after fasting 8 hours and the results give the doctor an average
of how glycated the red blood cells have been over the previous 3 months
. When glucose is in the blood stream, it pairs up with red blood cells and joins the hemoglobin within the cells for the lifespan of the red blood cell (which is about
120 days). A poorly controlled or undiagnosed diabetic will have high blood sugar, of course, and this test will give a little history of how high it's been over the previous three months. The A1c can only give an average though. It cannot tell you that you've had highs, normals or lows. It's possible to have a normal A1c but still be diabetic like me because I am controlling my blood sugar, but when I take the OGTT, then the results show I cannot metabolize glucose normally because my blood sugar will be very high on that test. So, let's say you stay pretty well on a low carb plan and control your blood sugar on a daily basis but during the holidays you go ahead and party, eat some cake, pies, etc. a couple of times, but then you go back and stay on your good diet, then your A1c might still be ok as long as during the rest of the time, you were careful with what you ate. Your A1c might be a little higher but not critical. I think during the holiday season, it's very hard, even unreasonable, to say you will never eat a piece of pie or cake or a
cookie. I will but I'll choose wisely. I'll eat a piece of cake but a smaller piece and leave the icing. I'll eat 1
cookie but not 6. In that way, I hope that I won't mess up too much. Anyway, I don't think it's a good idea to binge. I hope that helps answer your question?