Jason Galloway completed this course, spending 2 hours a week on it and found the course difficulty to be medium.
This course is a good overview of the latest thinking on health and nutrition. I learned a lot, some of which was surprising (like, for instance, the role of exercise in weight loss). That being said, the course can feel a bit overwhelming at times because they cover a LOT of material, so you may need to self-study to make sense of all of it. Still, though, an interesting, useful class that I strongly recommend.