This. When multiple runners come down with "thyroid" problems, something is wrong.I suffered from Graves Disease (hyper), and I can tell you, once a thyroid patient, always a thyroid patient. When I was first diagnosed, I was a very sick person. There were times when I was making weekly visits to the doctor having my blood drawn to get my meds right. At any moment, your thryoid function could change, symptoms come back, and back to the doctor you go. Not to mention the meds I took could cause my white blood cell count to go down, forcing me back to the lab anytime I got sick to make sure my count was good. Mercifully, after three years, the Graves went dormant, and now I have normal function. However, I will need my levels checked for the rest of my life, as at anytime the Graves could return, or my thyroid could just go kaput because of what it endured. So why am I skeptical of all these thyroid problems? Because the only symptoms I've ever heard these runners complain of is fatigue, as if a heavy training load wouldn't cause that. When you have legitimate thyroid problems, you can sit on your couch all day and still be exhausted. Where's the goiter, the hair falling out, the dry skin, the unexplained weight gain, joint pain and swelling, puffy face, hoarseness, depression? And how lucky they are to just visit some doctor in Houston and take some medication to fix the issue, rather than struggle with the problem for years as so many others do. Not only that, there are so many - both Goucher's, Shalane, Rupp, Hall, Carl Lewis, Begley, Kennedy, Smyth (not all patients of Dr. Brown I should add). All suffering from a middle aged woman's problem? One or two may be legitimate, but the odds that all of them have hypothyroidism are fairly astronomical. Does any other country's runners have such a high rate of thyroids issues?Dont believe me? Speak with an endocrinologist or an immunologist. I have. A.) the ones I spoke with know of no legitimate study that confirms intense exercise causes hypothyroidism. B.) small doses of thyroid hormone can cause weight loss and may help with endurance. These people I spoke with aren't runners or track fans and don't really give a s#*t what these athletes are swallowing, either. They aren't going to voice their skepticism out of a loyalty to a clean sport. They have more important things going on in their offices and labs than what Nike does in theirs.