Does eating sugar a night before the fasting blood sugar test affect the results ?

Confabber asked:


I would like to know if eating sugar a night before the fasting blood sugar test affect the results next morning. For eg if I eat some good deserts on the night before my fasting blood sugar test the next day, will it affect the results drastically or mildly or none at all ?
I am sure it affects the PP test results but does it affect the fasting tests as well ?

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6 Responses to “Does eating sugar a night before the fasting blood sugar test affect the results ?”

  • 1
    Gab&Thomas
    February 6th, 2010 15:34

    Duh

  • 2
    Dr. Tom
    February 9th, 2010 05:46

    It’s called a fasting blood sugar test for a reason.
    Yes, sugar the night before will alter the actual results which could mean you can be diagnosed with hyperglycemia or type 2 diabetes and you may not actually have either.
    The difference may be moderate to drastic depending on the amount of sugars in the desert, how much was consumed etc.

  • 3
    david r
    February 11th, 2010 19:54

    Yes, it will affect your test. You need to fast at least 12 hours before the test. If you eat lots of desserts, your test will be affected drastically. You need to fast to get an accurate result.

  • 4
    griblit
    February 15th, 2010 01:04

    No.

    A fasting blood test should be 6-8 hours without any food or sugar, but the night before shouldn’t matter. If your body is deficient, your own glycogen (sugar from your liver your body uses when you’ve not eaten in a while) will be enough to raise your blood sugar for the fasting glucose test. That’s why it’s fasting- anything your body needs to do to show how well it works on its own can be managed overnight. Even a type II diabetic should be medicated well enough to stay within the normal blood sugar levels of a non-diabetic.

    Your body will have managed the desserts, poorly or not, by morning. You will be below 110 or your function is impaired- and if you ate sugar 6 hours ago and you’re still above 110, you ARE impaired. Even if you didn’t eat sugar, if you are impaired, your liver will put you high on its own sugar.

    If anything concerns your doctor about the results, he/she will order an HbA1c- hemoglobin A1c. This gives clean, decisive records of the average blood glucose levels over the past 2-3 months. It can’t be altered by your eating, just shows your body’s function. If you aren’t 4-6% on this test, you’re impaired. If you’re between 6-7%, you need meds, but you aren’t causing secondary damage yet. If you’re above 7%, you are likely causing complications down the line. You need to cut all sugar and starch until the medicines get worked out.

    Eat your ice cream- just not within 6-8 hours of your test- and if you’re diabetic or even slightly overweight, you should stick to sugar-free if possible. Use common sense. If your test is routine, ignore all the rest and eat desserts!!

    Cheers!

  • 5
    healthsinfo
    February 17th, 2010 13:06

    Hi friend
    Probably yes.

    Please visit

    for more info on diabetes

  • 6
    Tsunami
    February 18th, 2010 08:28

    if you are diabetic it won’t matter if you at that or not it will show high sugar if you are diabetic. they dont’ want you to eat more sugar cause if it goes to high you can get into coma and be put in hops. that is why.