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One possibility is that GLP-1R endocytosis is required for agonist uptake by the brain via hypothalamic tanycytes, as described for leptin 65
The relationship between thyroid function and metabolic health is bidirectional and complexthyroid hormones influence glucose metabolism and insulin sensitivity, while metabolic dysfunction can affect thyroid hormone conversion and action at the cellular level

BMC Complement Altern Med (2017) 17:395

If you're in the early weeks of tirzepatide therapy and experiencing rapid weight loss, centers may ask you to wait until your weight stabilizes before donating, as frequent weight fluctuations complicate the donation process
