I did a lot of research on thyroid and weight issues when I first got serious about losing weight. One of the things I found out was that even though my thyroid levels are "normal" my TSH was high according to some new studies that are out. Apparently the TSH should be between 1 and 2 in order to lose weight. I went to my doctor armed with these new studies and talked him into upping my synthyroid levels to bring my TSH level down. My doctor was the one who suggested the lc eating plan. I believe it is the combination of lowering my TSH and changing my eating that has allowed me to lose 25 pounds so far.

Here is a great site on the thyroid:
http://thyroid.about.com/mbody.htm