Last reviewed January 2026
In fact, its thought that up to 90% of people following these diets have a deficiency
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[149] Derived from Table 2 available on [150] History [edit] Between 1849 and 1887, Thomas Addison described a case of pernicious anemia, William Osler and William Gardner first described a case of neuropathy, Hayem described large red cells in the peripheral blood in this condition, which he called "giant blood corpuscles" (now called macrocytes), Paul Ehrlich identified megaloblasts in the bone marrow, and Ludwig Lichtheim described a case of myelopathy
The truth is that any thyroid patient who suffers from LOW thyroid (including those with hypothyroidism, Hashimotos, those who are post-RAI, and post thyroidectomy) is at increased risk for Vitamin B12 deficiency
