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Your TSH (Thyroid Stimulating Hormones) level shows how hard your body is signaling itself to put out more thyroid hormones. If your thyroid isn't working properly, your body keeps signaling for it to spit it out and if it can't, your TSH gets high because the hormones are low.

So if that level is too high, it tells the dr that your hormone levels are too low. Synthroid, Levothyroxine, etc are synthetic replacement hormones that fool the body to make it stop sending out signals for more. If your TSH is high, your metablolism will be low and you might have trouble with added weight. It takes a fairly significant imbalance to make much weight difference though... My TSH when I was diagnosed was 61... it's supposed to be around 3. Going on the meds helped me to lose 42 lbs.

I know many who had TSH levels under 10 who went on meds and didn't lose any weight, but definitely felt better once they kicked in. It will take several weeks to correct an imbalance and if yours if significantly off like mine was, it takes months.

The downside to giving too much is that while it might help you lose weight, it also decreases your bone density, can make your eyes bulge...and other systems are thrown off by it. So neither extreme is good.