To format a computer means that all your data will be lost. Your operating system, programs, emails, drivers, pictures, everything! All of the updates on your programs will be gone, infarct the every entire program will be gone.
This drop in TSH is an attempt to return circulating thyroid hormone levels to normal. So, a test to measure the amount of TSH in your system will usually show lower than normal TSH when the thyroid is overactive. So, in general, LOWER TSH = OVERACTIVE THYROID / HYPERTHYROIDISM.
The study concluded that a TSH above 2.5 is associated with an unfavorable metabolic profile. In the event your TSH is above 2.0 it is my opinion you should first NOT accept this as normal and second you should seek a health professional knowledgeable in the identification and treatment of thyroid disorders.