Hello Dr., After watching your recent videos on more thyroid related topics, I would like to know more about this. Even if we have never been told by doctors that something is wrong with our thyroid, it was my first time learning from your videos that some sort of deficiency or problem with thyroid can be concluded from simply feeling chronically tired. Would you say that similar to testosterone, thyroid hormone has become a issue in recent years compared to the many generations before? I have been categorizing my own chronic tiredness at times, especially from going outside in and social situations, as just being "introverted". I feel fine when going to the gym or exercising on the other hand. Perhaps this is something that most people have and just haven't been told about? I would love to know more about the function of the thyroid, how to self assess if its working properly, whether we need exogenous thyroid hormone based on specific feelings of exhaustion, and if there are any side effects with taking thyroid hormone (negative or positive effects as well). I'm glad that you started making more videos about this as I likely would not have learned about this topic otherwise. Thank you