I think the impact of foods and diet are very individual.
When on Phase 1 I tried to pay attention to the protein sources and tried to mix them up, plus my "meat" sources were vegetarian, so I tried to be sure I wasn't having, say soy dinner protein and all soy packets in one day.
I had TSH level measured a couple of months before starting IP and again at about 50 lbs lost (about 6 months). They were nearly identical.
I then had TSH level measured after about 8 months in maintenance. TSH level was much lower (near low end of normal).
I am not cold all the time now.
I really wish there was somewhere to go to get scientific advice on this stuff (what to eat, what to avoid) but there really doesn't seem to be enough data out there.
As far as gluten, I intentionally didn't avoid it in IP products because I thought if I did I would make myself sensitive to it or whatever. Not sure if that one has much science behind it. Also, seitan, a protein source, IS gluten. I just didn't use it very often.
My "go to" IP products in phase 1 were IP Chocolate Drink Mix, Vanilla Pudding, Chocolate Soy Puffs. Later I added the Chicken A la King Pottage, Strawberry Wafers and Mango Ready-to-Drink into the mix. Those products are a mix of whey and soy proteins and varying levels of gluten (some none).
I find the whole hypothyroid thing really fascinating. Just read some things on a correlation between Free T3 and Free T4 and the kind of bad abdominal fat we are all trying to eliminate/keep at bay.
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