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Posted 11/7/2012 2:58 AM (GMT 0)

Hi Lanie: 

The other night I wanted to do a fasting test the next moring. However, during the night I got up and had 3 of those small Dannon Carb/Sugar Control yogurts and one Babybel chesse. I took my BS reading the next morning and my reading was 90.

This morning I did a fasting (without eating from the night before) and my BS reading (average) was low 90s (took two readings to be sure).

I wonder why/how my first one, after eating 4 Dannon Carb/Sugar Control yogurts (I know - too many) and one Babybel cheese, could be 90. I thought my reading would be higher because of the food intake half way through the fasting. Or did my body just "clean out" the food intake 2-3 hours after I ate it? Or did the reading just treat this as though it was a regular daily postpranial tes,t where you test 90 minutes after the food intake? But then, a reading of low 90s would be pretty good for a postpranial test, wouldn't it?

If I remember correctly, same thing happened several months ago (eating half-way through the fasting). Reading next morning was 91. I thought the reading would have been higher after eating about half way through the fasting? Or maybe, as I said, my body treated this "fasting" test just like a postpranial test?

What is the purpose of the 8-10 hour fasting before a morning BS reading? To see how your BS is after no food for 8-10 hours?

P.S. At my age (76) I have become quite nervous about my health issues and thank you for answering my sometimes seemingly "stupid" questions. But I am sure there are some folks who have wanted to take a fasting test reading in the morning and then (absentmindedly) had some to eat halfway through the night. I wonder if they took the reading or not?

Hope I have explained the above so it could be understood.

Apologies for any typing erros.   So many things to worry about now-a-days.

(Do you ever hear from Warren any longer? I believe he was a member a while back.)

Posted 11/7/2012 4:47 PM (GMT 0)
Hi Bob. I'm not exactly sure because I'm not a doctor (you already know that! :-) ) but your fasting result after you ate that yogurt during the night could reflect that you metabolized what you ate very well! That is, a person without diabetes and who is not insulin resistant can keep his blood sugar quite level and maybe that's what your body did. This is really good!

Also, you didn't eat heavy carbs. The yogurt and cheese may have had some carbs but not much.

A diabetic would probably have had a much higher fasting result, so you're doing well.

Many old posters here haven't been seen recently. Life goes on. Don't worry about typos. Sometimes I read so fast I don't even see them, including my own. tongue
Posted 11/8/2012 3:21 AM (GMT 0)
Thanks Lanie. You are always so helpful.

What is the purpose of the 8-10 hour fasting before a morning BS reading? To see how your BS is after no food for 8-10 hours?

Or wouldn't you know the answer and that is why you said " I'm not exactly sure because I'm not a doctor?"

Do you know?

Thanks again for all the help.

Posted 11/8/2012 2:12 PM (GMT 0)
Good morning, Bob. I believe the fasting is to allow your blood levels of glucose to go to your personal normal levels. We're all different and I suppose a diabetic's level of blood glucose while fasting would be higher than a non-diabetic's, which is what the doctors are looking for.

The first time I became aware of all this was years ago when I bought "The South Beach Diet" book. There are three phases to that diet and for the first phase, he says to cut out all carbs so the blood sugar will level out to our norm. That's when I understood how carbs affect our blood sugar. For me, being told I was borderline diabetic at that time, this was very enlightening.

According to Dr. Erich Rosenberger on a Yahoo site, "...On a daily basis, the normal range for blood sugar and lipids undergoes changes hour to hour depending on recent ingestion of food and drink. By fasting, one is getting a baseline sugar and lipid value that is not influenced by a recent meal."  

So this is why they ask the patient to fast before a blood sugar and a cholesterol test.  The doctor wants to know what your baseline 'value' is, that is, how much glucose is running around your system without having eaten or drunk anything to affect the result.

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