I constantly read (on the Internet) that low carb is 'bad' for thyroid. I have Hashimoto's, but I'm also incredibly carb sensitive and eat no more than 20g of carbs daily--and have done so for many years (with a carby day about every 2 months or so). My endo knows this and says that it does not harm my thyroid.
As an indication, after I was diagnosed, my meds remained stable for the first 5 years, even though I was eating very low carb the entire time. Surely if there was some slowing of my thyroid, I would have required an increase in dosage? (I'm checked every 4 months).
When my T3 tanked a few years ago, and I had to add Cytomel, I asked my endo again about my WOE because I'd 'read' that low carb inhibits conversion of T4 to T3. He told me that conversion problems are 'characteristic' of Hashi's and my WOE was not responsible.
I have never seen any scientific evidence that low carb causes any thyroid problems.
Thanks Emmie! Sounds like you have a great endo too!
Originally Posted by emmie
I like eating lower carb. I'm thinking that I might start supplementing with selenium instead of just eating brazil nuts just in case it can cause T3 problems . Do you supplement at all with selenium?
How are you doing now with your thyroid?
I sat at 30 net carbs for most of my weight loss (175 pounds). I hit a plateau since December of last year with 30 or more pounds to go and have been trying to figure out why. So I added more "lift heavy things" aka weight lifting, etc. to my workouts and immediately, all my thyroid symptoms came back (cold hands/feet, fatigue, dry skin). My usual thyroid tests all looked normal but my endo didn't and hasn't tested T3 and has always kept me on T4 only. When I added more carbs in, I started feeling better and my symptoms lessened.
Originally Posted by brookesam
I was never diagnosed with diabetes even at my heaviest weight but I was no doubt heading there fast (signs of insulin resistance).
I've been in the 40-60 net range for about 6 months now with up to 100 or so on workout days, then an occasional refeed (that really helped me feel better). Haven't lost any more weight, but haven't gained much either but still have some thyroid symptoms. I finally got my T3 tested by a different doctor and found my T3/rT3 ratio is 9.6 which is suboptimal (should be over 20).
Understand that I was also at 30 net carbs and around 1700 calories for over 3 years with no real diet breaks. Not sure if the rT3 issue is due undeareating carbs/calories, due to Hashimotos, or anything else but I'm trying to find a new doctor that might be able to help me figure out where I am and what I need to do next, including supplementing T3 if needed..
Right now, I'm taking a diet break to see if I can feel better and improve the rT3 ratio.
I haven't seen any scientific research either, but I've seen/heard tons of anecdotes that very low carb (less than 50g per day, which I don't normally do) leads to symptoms of hypothyroid. Could be related, or it could be something else.
I'm having the same issue, my TSH is trending up and my T4 is getting lower. If I have the same issue next time I get bloodwork I'm going to suggest to my doc that we try a different treatment approach. I've been on T4 for years and my TSH has always been at least a little high, and my T3 is usually low. I suspect I'm just a poor converter.
Originally Posted by brookesam
The possible issue with VLC for some people does not impact the function of the thyroid. It can impact thyroid hormone conversion. Thyroidmanager.org* suggests that people need a minimum of 50 grams/day of glucose for good T4( storage hormone)to T3( active hormone) conversion. With this in mind, ingesting less than 50 grams of carbs/day long term MAY negatively impact conversion.
I recall reading somewhere (can't remember where) that an issue with VLC and conversion is person specific- not impacted at all, impacted quickly with VLC, impacted after long term VLC or something in between.
That being said, other things can impact conversion as well:
1. Not eating enough
2. Low selenium. 200mcg/day is needed
3. Low Vitamin D
4. Low ferritin
* Effects of the Environment, Chemicals and Drugs on Thyroid Function – Thyroid Disease Manager
scroll down to Nutrition
The Non-Thyroidal Illness Syndrome – Thyroid Disease Manager
scroll down to Low T3 states
Originally Posted by emmie
OMG you found an endo who will prescribe t3 and doesn't call it all 'vodoo'???
Sometimes I wonder about the whole not eating enough. I think maybe I under ate for a while in combination with too much exercise but that was a couple of years ago. As far as I know, thyroid function was pretty stable at that time. I would tell my mom how many calories I was eating and she thought that it was too low cal combined with all the exercise... and I was only maintaining my weight. But I would eat more on the weekends though.
Originally Posted by marcadav
I've been doing some research on doctors in my area. I found one that looks at everything from heavy metals, T3, and who knows what else... He sounds really thorough. I'm super excited for my doctor's appt in a couple of weeks and that's a first haha
Originally Posted by lucy1984
From reviews I've read and saw on his website, he actually takes time to talk to you about symptoms and gets a good background from his patients.
Do you supplement with selenium? Do you eat low carb? I mentioned to my new doctor (which I'm not going back to) T3 and she said only 1% of thyroid problems were due to T3 conversion issues. And I'm thinking, how do they know if endos never seem to want to test T3?! lol
Originally Posted by Danielle5690