Now that winter has hit the northern hemisphere, our thoughts often focus on ways to keep warm.

Okay, folks, we've seen this before in various forms, and now we're experiencing it once again. It has all the right buzzwords from devotees, like "detoxify" and "rejuvenation" and "cleansing," and a celebrity set hopping on board.

thIn 1984, Tanjaniina Laukkanen, MSc from the University of Eastern Finland and colleagues from Emory University and Catholic Unive