TSH: The pituitary gland (in our brains) sends a signal to our thyroid gland to release thyroid hormones (T4 & T3) into the bloodstream when we are low on the thyroid hormones. When the thyroid isn’t working optimally, it will send low amounts of T4 & T3 into the body. (**Testing this alone does not paint the whole picture.)
T4 (thyroxine): 80%-90% of T4 is released by the thyroid. T4’s main job is to convert into active T3 hormone which is the fuel we need. (Important and must be measured in blood test)
T3 (triiodothyronine): About 10-20% of T3 is released by the thyroid, the rest must be converted from T4 to T3. T3 is critical to life and involved in numerous bodily function including keeping your body temperature in check. In order for T3 to do it’s job, it must enter your cells. If it does not enter your cells all it does is travel in your bloodstream and does not do the work it’s supposed to do. (important and must be measured in blood test)
Reverse T3: This is the leftover T4 which was not converted into active T3. This excess T4 will be converted into biologically inactive T3 to be cleared out of your body.
The following can impact the conversion of T4 to T3: liver problems, gut dysbiosis, selenium deficiency, stress, poor diet, adrenal issues, blood sugar imbalances, etc.
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SIBO (SMALL INTESTINAL BACTERIAL OVERGROWTH)