Gary Taubes, author of the excellent book Why We Get Fat: And What to Do About It with an amazing story of how sugar and high fructose corn syrup makers convinced the world that they were healthy!
This is truly a must read piece! Unfortunately, it goes to show how "science" can be used with bias to prove just about any point. We must all exercise due diligence and use critical thinking when confronted with any news or information. Who paid for the study? Who do the researchers get grant money from? What type of study is it and how well designed is it? These are all questions we need to ask when evaluating new information.