The topic that I have been thinking about most often is probably stress. Perhaps because at the end of my first semester of college there seems to be tons of it...! I found it fascinating that just the presence of stress can be quite detrimental to your health. Not just because of things one typically does while stressed (not eating well, not sleeping well, and so on), but having stress even when taking care of yourself the same way is unhealthy. Stress can be brought on by a myriad of things whether it be attachment, grief, and pretty much every topic we covered in the course.
I feel that we covered the topics quite well in general. However, it seems that while we exhausted what happens to health in many scenarios, I do not recall as much conversation around how to make healthy changes. It would have been interesting to discuss the different views people have on how to "fix" problems that come up involving relationships and health. Alas, it is quite possible I was simply focusing on other things and missed it (this has been known to happen to me).
As for the article about sex education, I loved the scenario at the beginning of the article. Open conversation is so healthy in general, and when the topic is something as serious as sex, it is imperative that it is talked about! I feel education complete with class discussion is the best way to foster learning and get teens (and adults) to be open with their thoughts.