In this course we will review how the Darwinian theory of evolution by natural selection can help us understand and treat human disease. We will explore evolutionary explanations to questions such as: Why do parasites harm us? Why do we age? Why do we suffer from allergies or develop cancer? Why do we reproduce sexually? Through informal lectures, readings, student presentations, and class discussions, the students will become exposed to basic evolutionary principles that can be applied not only to medicine, but also to agriculture and other life sciences.