i eat salt on my food but i try to eat healthy and always excersie all my life
Try to find out what is causing your thyroid issues, if it's Hashimoto's or not. If it is, avoid iodized salt and MSG. If it isn't, iodized salt may help if it's just a sluggish thyroid without autoimmunity issues. Sea salt and Himalayan salt have trace levels of natural iodine, but are much safer alternatives for Hashimotos.
The more I look into what's causing my own disease (Hashimoto Encephalopathy), the more I see links to the emergence of Hashimotos first reported in 1912, the invention of MSG in 1908 (4 years before), and the statistics saying that the disease is more prevalent in Japanese and Oriental people. Mono Sodium
Glutamate affects the glutamate nerve receptors of the brain causing more nerves to activate. When they get over activated too long, it can cause damage to the nerves (exitotoxicity).
MSG makes you hungry and speeds up your metabolism. This will tell the brain to make more thyroid hormone (the thyroid gland, not in the actual brain). The thyroid works on a sort of balance of iodine and selenium. When there is too much iodine, not enough selenium, and not enough glutathione (used up by inflammation, stress, converting food to energy), free radicals in the form of hydrogen peroxide can start attacking the thyroid (causing Hashimotos).
Now, think of a fast food diet high in MSG and iodized salt. Too much MSG sends too much glutamate to the nerve receptors putting your body in overdrive. The thyroid processes as much iodine into thyroid hormone as it can to speed up your metabolism. At first, having that extra iodized salt helps keep up with demand, but it does nothing for the protective side of the thyroid keeping the balance (the selenium and glutathione). This can cause the autoimmunity damage to the thyroid. The MSG can cause damage to nerve receptors in brain. If the hydrogen peroxide from the antibodies pass the blood brain barrier, that will cause swelling, encephalitis.
Remember that the body has checks and balances to prevent things from going wrong. The body can recover it's glutathione reserves over time. The brain can heal itself to a degree with proper rest. The thyroid can likely heal to a degree as well if selenium and iodine are brought back in balance quickly. However, if you are working long hours, long term, with poor sleep, on a fast food diet, and stressed out, you're more likely to develop these types of problems.
Right before I developed Hashimotos, I was an electrical apprentice for close to 3 years. The last job, I was working 56 hours a week, then being asked if I could teach a martial arts class when I got home. I was stuck on a fast food diet with 0 time to cook a real meal. I'm sure that didn't help my health.