How do you lose weight after a medical problem that caused the weight gain? I was diagnosed with hyperthyroidism a few years back. I was treated with radioactive iodine and it got rid of my thyroid gland. The doctor I was seeing at the time never gave me a medication to replace the thryoxin the thyroid naturally produces..and is vital to the body's functions.. which caused me to DOUBLE my size in a very short time.  It has been about 3 or 4 years now of trying to get the synthroid dosage [yes, I changed doctors] adjusted so that my system is at a normal level.  NOW, I have about 150 pounds I need to lose.. a vigorous exercise program is impossible because I have also been diagnosed with asthma.  Diet pills are not an option with my medication.. and I refuse to have gastric bypass surgery because I don't eat very much anyway, and the function of gastric bypass is to cause you to eat less.  So what do I DO??? Help!! I don't wish to live my life this way.. I have a young child and I want to play outside with her.. and I want to be able to go for long walks again.

Summarized question: What is the best diet for someone with hyperthyroidism who needs to lose weight?