November 25, 2008 3:31 pm The Truth Behind Popular Diets Low-fat, low-carb and fad diets. Which is the best approach to losing weight? Experts tell you how to cut through the promotional hype. Local 2:27 Vitamin K shots for newborns: A doctor debunks myths and explains why the shots are essential 2:09 DC clinic offers mental health support for children 2:24 ‘We need to save our kids': Mother who lost son to fentanyl fights for change 2:31 Spine surgery technology used in DC reduces operating time 2:21 Family honors boy with foundation to find cure for rare form of cancer