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Went from extreme hyperthyroid to extreme hypothyroid on Carnivore diet after 2 years, looking for answers as to what may have happened.

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After about 2 years on Carnivore diet I had a major shift in thyroid condition. I went from extreme hyperthyroid (graves) with a fairly large goiter on the right side of my neck to extreme hypothyroid. I first noticed the goiter starting to get substantially smaller about 1 year ago. Then symptoms of tiredness and being cold all the time came along. In addition muscle fatigue and weakness set in and then eventually neuropathy in my feet and fingers. I could hardly hold my arms over my head to wash my hair. I'd go for walks in the summer but could hardly walk around the block as my legs would suddenly get very fatigued and low back get sore so I decided to come off carnivore for a while to see how that was going to go. More recently my lymph-nodes have swollen quit a bit, it seems the enlarged goiter had moved into the lymphatic system. I now noticed I have sleep apnea and drooling on my pillow along with dry eyes and change in vision.

I was also taking Ivermectin daily at 0.4mg/kg so it left me wondering if it was the diet that caused the shift or the Ivermectin or the combination of both.

I will admit I may not have been eating enough fat and or butter on carnivore and that I mostly ate grassfed/grass finished organic beef as I am friends with a farmer who raises certified organic beef.

April 21/2023 bloodwork showed free T4 @80.5 pmol/L with normal being 10.0-25.0 pmol/L and free T3 @>30.8 pmol/L with normal range being 3.0-6.5 pmol/L, with TSH @ 0.01 mlU/L with normal range being 0.20-6.50 mlU/L.

I had afib which I managed well with Beta Sitosterol

Jan 9/2025 bloodwork showed free T4 @2.3 pmol/L and free T3 @ <0.3 pmol/L with TSH @ 18.24 mlU/L

July 11/2025 bloodwork showed free T4 @1.5 pmol/L and free T3 @<0.3 pmol/L with TSH @ 25.16 mlU/L

My Dr told me that after many years with hyperthyroid that my thyroid simply burned itself out and of course wanted to immediately put me on syntheroid. I understand that this is the only explanation the Dr is allowed to give but I think it's total BS

From what I've read and watched in video's Carnivore is supposed to be good for hyperthyroid as well as hypothyroid so I'm left wondering what happened. Has anyone had a similar experience? Anyone have an idea of what's going on with me? I want to go back on Carnivore but don't want hypothyroid to get worse than already is if that's even possible. Any input, opinions or help understanding will be appreciated and welcomed.

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