Source: http://www.fastcodesign.com/3024766/evid...

Taking all their findings together, the researchers argue in an upcoming issue of the Journal of Consumer Psychology that an instinct for water may indeed play a role in fondness for glossy. "First and foremost, this paper shows that our preference for glossy might be deep-rooted and very human," says Patrick. "It is humbling to acknowledge that despite our sophistication and progress as a species, we are still drawn to things that serve our innate needs--in this case, the need for water."