Among the various foibles of decades past — including gems like mullets, polyester leisure suits, and eyebrows plucked within a millimeter of their existence — lies the idea that low-fat and fat-free foods are super healthy. As it turns out, the nutrition mantra of the '90s was totally wrong. According to CBS News, a Tufts University study showed that "people who consumed full-fat dairy products had as much as a 46 percent lower risk of developing diabetes" compared to people who ate low-fat and non-fat dairy.