Cold plunges are all the rage. Groups dedicated to the practice have sprung up around the world, while a seemingly endless number of companies offer portable ice baths for just such a use. These organizations tout the potential health benefits, including reduced inflammation and anxiety. But as experts tell NPR, the research behind these claims is generally thin to nonexistent. Now, a new study is adding to the research that does exist, at least when it comes to perceived benefits. Researchers at University College London surveyed 1,114 women who regularly engage in cold water swims and found …