Introduction
Your thyroid gland makes thyroid hormone. Thyroid hormone increases your metabolic rate and does a lot of related things. Your hypothalamus is governing that by controlling your pituitary, the master endocrine gland, and its secretion of TSH, which is what controls the thyroid gland and makes it make more thyroid hormone.
The way that the feedback occurs is that the circulating T4 is converted to T3 inside the cells of the pituitary. That is what suppresses the production of TSH, which is basically the pituitary monitoring the thyroid hormone levels to know whether the thyroid has done its job. If the pituitary, the master endocrine gland, decides that the thyroid has done its job, it takes down TSH, the signal to make more thyroid hormone.
This Q&A can also be found as part of a much longer episode, here:https://themasterpass.chrismasterjohnphd.com/products/mastering-nutrition/categories/2811841/posts/9361575
Listen to the Audio
I highly recommend watching the video above but you can also listen to the audio here:
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