RunningDoc wrote:
I have a controversial opinion on this issue, but feel like I have the knowledge to make a strong argument. I ran collegiately, and have am a M.D. with a sports medicine fellowship. The runners/patients who I have talked with about this condition usually have been doing too much high intensity training, which induces a response in the body that causes several hormonal and chemical disturbances. There is absolutely no reason why healthy young athletes should be having thyroid issues. They would not be able to train hard in the first place if they did. Their thyroid is not operating at 100% because they have simply been pushing their bodies too hard. You might have an endocrinologist tell you otherwise, but he likely does not know the first thing about endurance training. Running fast is very hard on your body, both inside and outside, it is as simple as that.
You have a controversial opinion on this issue simply because it is your OPINION, and not backed up by much medical evidence.