Hi @bsell, @bigmo1234 and @mskdka
I am 55 and recently diagnosed T1
At the same time diagnosed slightly hypothyrodic
20 yrs ago I was severely hyperthyrodic but managed to level it out very well with Tapazole.
Endo says not unusual for a woman in 30’s to be hyper, then turn to hypo in 50’s
Now taking the 25 mcg synthroid generic
So I find The thyroid med consistently lowers my BG, every morning, from between 10-30 points.
I take readings before I take synthroid (70-95)
And an hour after (60-80)
So I use it as a regimen to keep within range. I’m not eating until at least an hour after I take it, so it can give me a little wiggle room at breakfast.
Now I will say this much about weight gain.
Insulin makes me gain, and Metformin makes me lose.
Walking gently keeps me in range, so does the combo of insulin and Metformin
And I’m not bolusing-- yet.
I lost too much weight from being undiagnosed for way to long. To the point my family sat me down to intervene.
They thought I wasn’t eating (I was!!! Like a pig)
What I’m trying to say, is, whether you are T1 or T2, there are now studies which show the health benefits of Metformin. It can also attribute to some weight loss. It’s probably why I still lost weight after going on insulin, until I needed to increase my basal insulin.
Now, about weight gain and synthroid:
if synthroid is supposed to increase thyroid production, then it stands to reason that it alone would not be the cause of weight gain?
YDMV, and your hypothyroidism may vary too.