Oh dear, sometimes I come across a depressing paper which all the same is informative. This one links Alzheimer onset likelihood to FT3. Hope I haven't upset people with this.
Low serum concentration of free triiodothyronine (FT3) is associated with increased risk of Alzheimer’s disease
PatrickQuinlan, AlexandraHorvath, AndersWallin, JohanSvensson
Prospective study in a single memory clinic (n = 302).
Mean follow-up of 2.8 years.
Serum TSH, FT4, and FT3 were assayed in subjective or objective cognitive impairment.
Low serum FT3 associated with increased risk of progression to Alzheimer’s disease.
Serum TSH and FT4 were not associated to the risk of conversion to dementia.