Woo,
Quote:
There does not appear to be another cause (TSH levels are fine for example).
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If you're taking your doctor's word on this, you might be mislead. There is such a thing as sub-clinical hypothyroidism and it is generally undiagnosed. You really need to look at 3 different tests:
TSH -- The range has recently been lowered to 3, but even I felt horrible at a TSH of 2.
FT3 -- The amount of Free T3 (not to be confused with T3, which is total T3. Your body can't utilize T3, its been bound to a protein, it can only use Free T3 (FT3)). There does seem to be a correlation between extremely low carb diets and poor FT3 conversion.
FT4 -- The amount of Free T4. This is used directly by some tissues but mostly gets converted to T3 by losing an iodine molecule, which is done in the liver.
My hypothyroidism was undiagnosed for many years until I read up on the newer tests. Doctors are doing an utterly abysmal job of diagnosing it. Basically unless you have a rare doctor, probably one who is also hypothyroid, you've got to go get the health tests done yourself.
And just because you're "in range" doesn't mean that's an optimal level for you. Women generally feel better in the upper 3rd of the FT3/FT4 ranges. Really good doctors ask you about your symptoms in addition to looking at your blood test results.
thyroid.about.com (pretty good site)