What Causes Low TSH, Hair Loss And Alopecia?
Thyroid
Detailed Answer:
I follow what you are saying here.
A low TSH is a potential sign of an over-active thyroid ie 'hyperthyroidism'. Hyperthyroidism can cause hair loss.
When I see someone like you in my practice, I order the following tests in addition to a thorough physical examination:
CBC
CMP
TSH
Free T4
Total T3
25 hydroxy Vitamin D
None of these tests require fasting and they can be done at any time of the day.
Rechecking the TSH is helpful to be sure it is abnormally low.
Further testing may be necessary based on the results of the above tests. For example if the TSH is still low, especially with a normal or elevated Free T4 levels then a Radio active iodine 123 Uptake and Scan test is required to know what type of over-active thyroid condition you have.
There is one that gets better on it's own versus another which requires different treatment options.
Follow up
Detailed Answer:
No.
To the best of my knowledge of published medical literature, there is no scientific evidence that stopping Soy improves hair loss