I also recommend Robert Sapolsky's Stress and Your Body on the basis of the first two lectures (I'm finishing Nutrition before I finish this one) and the books of his I've read. He's funny and dynamic. I also note that, at the moment, the course is on sale for $34.95.
And as long as I'm recommending courses I've recently listened to, if you listen to the Skeptics' Guide to the Universe you may already know that Steven Novella also has a course out with them. We bought it (on sale, natch!) and I've listened to it and recommend it. Medical Myths, Lies, and Half-Truths: What We Think We Know May Be Hurting Us
* Now The Great Courses, I think.
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