Weight loss like everything in life must start with the desire and then the realisation that it is a life altering goal, and may require some effort especially if you are over thirty!
i too have a hypothyroid condition, but have always maintained an FAA class1 medical with no restrictions.
The inportant thing is that you take your medication everyday and you maintain your T4 Tsh levels where they should be. Of course allittle excercise does help..you dont have to join a health club!!!! just park the car and walk! thats all. Hypothyoidism is a very sneaky desease if you mis a day or too it wont hurt you but if you do that too often the effects can addup!!
also because this organ affects ALL the major motor and Vital organs in the body it can cause otther complications.
So before you go to the FAA doctor goto your personal physician and get a checkup and a complete blood work especially T3 T4 TSH
before you go to the FAA class 1
hope this helps