I have thyroid issues and limit myself to 50 carbs a day or less. It doesn't seem to be bothering me.
I've read in several peoples' posts that they are hypothyroid so need to keep their carbs a bit on the higher side to be able to lose weight and feel good. I'm wondering if there is any research I could read about this or if people are just finding this out by trial and error.
I am hypothyroid and was undermedicated for several years before I found a new doctor. He switched me over to Armour and recently upped my dose again (yay!) to see if we can get rid of my biggest symptoms once and for all.
Assuming I am (or will be) properly medicated, do I still need to keep my carbs up? How do I know?
I don't know id there is any research or not, since 'low carb' is considered a fad diet for the most part. I know if I go too low i won't lose. I was frustrated when going bleow 50 for a few weeks and just being stuck. Went back up to about 75-100 and lost consistently.
I suppose it is like a lot of things that it varies per individual. Also, it might be something that is a long term effect. I know that a low carb diet that is too low in cabrs can cause hormonal imbalances, which is probably why it happens.
I agree with Meg that it's an individual thing.
For example, I have a SUPER high amount of reverse T3 (up around 300, and it should be around 30). Reverse T3 is what happens when you're under stress... your body takes your T4 and converts it to ReverseT3 (which is a fat-storage hormone) instead of T3 which is the usable, gotta get things done hormone. It does this because it sees stress as needing to conserve. And your body can see low calories or low carbs as conserving for winter and therefore we need less T3 which keeps our metabolism UP, and more ReverseT3 which lowers our metabolism and stores the fat easier.
The problem with too much Reverse T3 is that it takes up all the places where your T3 should "plug in" to your body. So you can't use the T3 you have as well. If it's still up at my next visit in April, I'm going to talk to the doctor (or my naturopathic doc) about laying off the T4 and just doing T3 in more concentrated doses for a couple-few months. Supposedly not having the T4 supplemented means you don't convert it to Reverse T3, and the RT3 begins to leave your system and the T3 replaces it. It's my last ditch effort to manipulate my thyroid hormones, but I'm giving it a few more months of my adrenals being back in order and eating right and meditating to see if I can get things situated on my own first.
Because I had a period of super high stress (adrenals were bottomed out, etc.), I'm coming out of a period of time where my body was doing all it could to conserve for bad times. So for me... I do whatever I can not to stress my system, so it can heal, and hopefully get back to homeostasis. I've made much improvement in the past 2 years, but my body is now just super self-protective. So I do whatever I can to make it see that I'm not going to starve, nothing bad is happening and it's okay to release all that fat.
As for research I found this in an interview with Dr. Eades:
Q: I've read that low-carb diets reduce thyroid activity, and one blood test seems to confirm that this has occurred in my case (after one year low-carb). I'm more prone to feeling chilly at times, and am generally more sluggish. Should I reduce my carb intake further (groan), per Atkins' "critical carb level" model, or do you have any other suggestions?
A: As to your question about thyroid activity: reduced carbohydrate diets (and reduced calorie diets) sometimes decrease the activity of the enzyme that converts T4 (the inactive form of thyroid hormone that is released from your thyroid gland) to T3, the active form. We sometimes give our own patients small amounts of T3 during the weight loss phase of the program. Micronutrients also play a role in this conversion, especially iron and magnesium, so you might want to make sure that you have adequate levels of both. (You need to check your ferritin level (the storage form of iron) before you take extra iron, because elevated ferritin levels are a consequence of excess insulin and a major risk factor for heart disease. Don't take iron if your ferritin level is up.)
Interestingly, it also looks like insulin resistance can affect conversion of T4 to T3....
Not everybody works the same way.
"Boy I got vision and the rest of the world is wearing bifocals" - Butch Cassidy and the Sundance Kid
Thyroid function is complicated. There are 2 main hormones, T4 and T3. T4 is considered primarily as the storage hormone. T3 is primarily considered the active hormone. A great deal of T3 is made through T4 conversion.
Problems with T4 to T3 conversion can happen for many reasons--stress, illness, starvation, deficiencies in selenium and Vitamin D.... Thyroidmanager.org states that insufficient carbs can impede thyroid function.
Scroll down to "nutrition"
Scroll down to "TSH in Pathophysiological States"
I think we are forgetting that we evolved to eat a low carb if not very low carb diet. No "fad diet" here.
I've never had my thyroid checked, but it doesn't make any logical sense to me that low carb by itself would be affecting thyroid function long-term.
And even if you eating vlc (like me) you still need a calorie deficit to lose body fat. I do and I am losing belly fat at age 47, female.
I think some folks may be confusing lower energy and other body symptoms of keto-adaptation (which can take months) with thyroid issues.
From Kurt Harris' PaNu blog:
My own view on the ratio of carbs in the diet should be pretty clear by now.
1) I think a wide range is tolerable for those with normal metabolism. For those about to ask "how wide" - OK, let's say 5% to 40% or even more if you can tolerate it and the rest of your food is very high quality. If your metabolism is damaged (you know who you are - type II or obesity prone) or you don't tolerate starches well like me, you should probably stay on the low end of carb intake.
2) I think the paleolithic principle itself argues against LC and VLC being damaging the same way it argues against plants and all carbs as being poison. It just makes no sense, as it implies that humans in any given econiche, even one rich in a huge variety of animal foods, would have been at risk of metabolic damage from being in long term mild ketosis if they were not able to find enough starchy tubers and fruit in season. (We've agreed that grains like white rice are a recent food, I hope).
Enough nonstarchy greens to choke a gorilla with an otherwise all animal diet will not keep you totally out of ketosis, I guarantee. If it did, I wouldn't want to share your bathroom.
Last edited by Dragonfly; 01-26-2011 at 11:24 AM.