One of the extraordinary things about current era is the public availability of large health data sets. It means that a random chump -- excuse me, analyst -- with a MacBook and R can have an evidence-based argument with anyone.
But there is more to using these data than just downloading a file. The Center for Disease Control's National Center for Health Statistics (NCHS) is a true treasure, particularly the amazing National Health and Nutrition Examination Survey (NHANES). From the introduction to the tutorial to using this data set.
Your pace working through the main tutorial will be greatly influenced by your previous knowledge, technical ability, and the amount of time you invest in the homework and quizzes at the end of each module. The estimated time for a person to work from the beginning to the end of the tutorial is 3-5 working days (6 - 8 hours per day).
(Emphasis in original.) Five working days? I hope they are kidding. A geological epoch in Internet time.