One of these is the idea of a "base tan," where people use tanning beds to get a tan before heading out to catch some rays, the idea being that they can avoid sunburn.
Well, the tanning bed will do the trick, but that doesn't eliminate the main complaint about tanning beds -- that they contribute to skin cancer.
So not all myths turn out to be false, but they warrant examination.
"We're trying to just show that it's important for us to examine commonly held beliefs," said Dr. Aaron E. Carroll, director of the Center for Health Policy and Professionalism Research at the Indiana University School of Medicine, when explaining his article for the British Medical Journal back in December, which took a look at some common myths surrounding the holiday season.
If you'll keep reading, we'll keep asking the questions.