Thyroid Hormone Deficiency (Hypothyroidism):
A grossly underactive thyroid gland (hypothyroidism) can lead to the symptoms of dementia. Simple tests can detect this condition. The symptoms include loss of interest, apathy, slowing down of mental abilities and poor short-term memory. Treatment involves replacing the naturally occurring thyroid hormones with synthetic hormone preparations. This is more likely to be effective in reversing the dementia if the problem is identified and treated within two years of its onset.
Personal note: This is just my opinion folks. As much as I agree with this information, I would seek out alternate therapies: meaning if I were diagnosed early enough, and having the symptoms of Alzheimers or dementia, I would seek out "natural" methods to supplement the thyroid deficiency. A good osteopath, or chiropractor may be able to help you with supplementing your body with natural thyroid.