You might want to take a gander at a great book called 'The Schwarzbein Principle' by Diana Schwarzbein M.D. (only $12.95) She is a cutting edge endocrinologist, has a wonderful clinic in Santa Barbara, CA and talks a lot about insulin resistance and adrenal burn-out as causes for people not losing the weight they want to lose. The Dr. also helps many women with sex hormone issues. Her website www.schwarzbeinprinciple.com has tons of information if you want to check it out.
(No, I do not work for Dr. Schwarzbein.....just know a lot of people who have been helped by her ;)
Thanks for posting that link to Dr. Schwartzbein!