Published: 18 December 2017
Author(s): Oscar M.P. Jolobe
Section: Letter to the Editor

The observation that thyroid replacement therapy increases mortality in elderly subjects with subclinical hypothyroidism [1] has, as its converse, the documentation of an association between hypothyroidism and increased longevity in the animal model of hypothyroidism [2]. The corollary, in human subjects, is that a serum thyroid stimulating hormone (TSH) level which is at the upper level of the normal range also appears to be one which is associated with increased longevity [3]. In the latter study serum TSH levels were shown to be significantly (p


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