As the year comes to a close, it's time for one of our favorite traditions , saying goodbye to questionable health trends we'd like to leave behind in 2015.

While the year brought promise in certain areas -- we moved away from fad diets ; the U.S. surgeon general endorsed walking as exercise; and the phrase "harm reduction " became a buzzword -- there were also some major letdowns. So in the spirit of Festivus , we're airing our grievances.

Here are six health trends that have sorely disappointed us over the past 365 days: