It's been dubbed "the Twinkie diet" by the media: Mark Haub, a professor in Kansas State University's Department of Human Nutrition, has been surviving on Junk Food for the past month.And, he's lost weight.This might seem to fly in the face of conventional nutritional wisdom. After all, junk food results in weight gain, right?Haub started the "Twinkie Diet" on 25th August. Since then, he's been