Over 99% of circulating thyroid hormones bind to plasma proteins such as thyroxine-binding globulin (TBG), thyroxine-binding prealbumin (TBPA), and albumin, contributing to T4s longer half-life compared to T3
When intra-portal insulin levels are increased (e.g., obesity, Cushings syndrome, or due to treatment with glucocorticoids and glucagon-like peptide 1 receptor agonists) or decreased (e.g., malnutrition, anorexia nervosa and type 1 diabetes mellitus), these changes secondarily alter hepatic GH sensitivity resulting in a secondary association with discordant GH and IGF-I levels (e.g., high GH/low IGF-I levels or low GH/high IGF-I levels, respectively)
The liver can contain high amounts of GGT, which will break down GSH
Because there are no symptoms in carriers, its hard to know exactly how many people in the general population have an abnormal copy of the gene