Thyroid gets worse when i diet - any tips?

[Mindy6]

Each time I go on a diet my underactive thyroid falls even further, and the diet fails. Does anyone with this condition have any ideas how to tackle this because dieting is hard enough without all the underactive symptoms resurfacing. Thanks.

I'm only recently diagnosed so excuse any ignorance. what is your tsh at the moment? maybe you are undermedicated already so that's why you find losing weight difficult? just an idea

Not sure which is which, 11.5 and 0.05. GP says cant lower the does as one of them is low already. I was feeling ok before dieting. This has happened several times before, which is why my weight slowly goes up year on year.

tsh is the 0.05 I would guess and 11.5 is the t4. have you had other stuff tested like vitamin d, iron, ferritin, b12. some of those give you similar symptoms to hypothyroid and some are necessary to get the most out of the levothyroxine. I'm just thinking that your tsh is great but your t4 doesn't look as good as you'd expect (do you know the reference range? you would try to get it right up near the top number or even beyond) so you could still be a bit hypo which might explain the weight loss problems. mind you, you say you feel ok so maybe not.

I don't know anything about diets but maybe someone else will. what kind of diet are you trying?

Thanks but i have no idea about t4 range unless you mean the upper level which i think is aboutis about 22, which is where i used to be but it has fallen over the years. I have never had anything else tested. I was following Sw low fat. Lots of salad unclean meat. Not enough sugar for me though (joke).

Mindy, get back on the diet and when you are feeling at your worst, go to the GP and get your thyroid tested. Hopefully then you'll get the treatment you need. A T4 of 11.5 is woeful! In my area the reference range is 12-24. Ask for a trial of a little levothyroxine for 3 months if they are umming and ah-ing, and point out how many times you've been to them in about this.