How is you tryglyceride levels? That should be easy to change with just a diet alone. I believe it is due to consuming excess calories than you really need.
[0] http://tpauk.com/main/the-tsh-reference-range-wars/
[1] http://www.ncbi.nlm.nih.gov/pubmed/18443261?dopt=AbstractPlu...
[2] http://perfecthealthdiet.com/2010/07/thyroid-more-evidence-t...