Can Thyroid Problems Affect Blood Sugar Levels?

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High Blood Sugar & Insulin Resistance Correlate With High T3

High blood sugar, insulin resistance, or high fasting blood glucose may all be caused by high T3 levels. Many on the T3-only protocol or high doses of desiccated thyroid notice their blood sugar levels rising and wonder why. It’s because thyroid levels, either too high or too low, have a direct impact on blood glucose. Hypothyroidism may cause high blood sugar & insulin resistance A1C levels of hypothyroid patients are generally higher than normal, and in one study, replacement with thyroid hormone brought the A1C down, but it did not lower fasting blood glucose. [1] A1C is a measure of average blood glucose levels over several months. This study shows that the hypothyroid condition will cause an overall higher average blood glucose than normal. Insulin resistance appears when thyroid levels are too low or too high. [2] Correcting the hypothyroid state is beneficial, but replacement with too much thyroid hormone may result in continued insulin resistance. A low T3/T4 ratio was found in pre-diabetics who had both high insulin levels and insulin resistance. These subjects had lower T3 levels and higher T4 levels than normal, glucose-tolerant subjects. This study confirms that a cer Continue reading >>

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Popular Questions

  1. Em_NZ

    Hyperthyroidism - BG rises in a non diabetic?

    Hi all, long time no see!
    My mother was recently diagnosed with hyperthyroidism, her numbers coming out over twice the max 'normal' amount. She's only just started taking pills for it, so far things aren't really improving but we're hoping for a good change real soon!
    My question is, can an overactive thyroid raise blood sugar levels in a non-diabetic? She's always had perfectly healthy BG results until now. Even now it's nothing tragic - her A1c was 6.3, which many of us would be proud of but I know it's a little high for a non-D.
    I'm pretty sure it's just the thyroid acting up seeing as it's affecting her whole metabolism - but just hoping someone can confirm that for me. And will it all settle down once the pills are doing what they should? Anything else I should know?

  2. drsoosie

    It is possible it could raise it a little, however according to my endo not likely. She should also have herself checked for diabetes or pre-diabetes. I have Grave's disease and when I had high BG last year, before I was diagnosed, I was convinced it was because my Synthroid was too high and I was consuming more sugar to compensate for the high metabolism. It turns out, being an auto-immune person, I actually had Type 1 diabetes. The symptoms are similar in the beginning to an over active thyroid.

  3. Em_NZ

    She's being sent for a GTT (ugh) so we'll see how that goes. I'm going to offer to go with her, I want to be there to support her - and also just see how it's done as I never had one myself!
    Also I'm going to her place for dinner tonight so I'll take my spare meter and do my own little GTT, testing before & a couple of times after we eat.
    6.3 isn't that high for a non-diabetic is it?
    I would not wish diabetes on anyone, and I'd freak if Mum got it! She's just had the test to see if her hyperthyroidism is auto-immune, so that's a result we're waiting for. If it is there's more of a chance of her prospective diabetes being T1... I think we'd all prefer T2, with an A1c like that she'd be able to control it well with diet & exercise as she's already pretty smart when it comes to nutrition.
    My diabetes has come through my Dad's side of the family - no trace of it at all in my Mum's (huge!) family. So I'm thinking that so far the odds are good for this to just be an oddity because of her body going a little nuts.
    Then again, maybe I'm in denial, because I really can't handle the thought of my Mum having to go through everything that I go through!

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