When Cristin Couzens went on the hunt for evidence that Big Sugar had manipulated public opinion, she had no idea what she was doing. She was a dentist, not an investigative reporter. But she couldn't let go of the nagging suspicion that something was amiss. Her obsession started in an unlikely place, at a dental conference in Seattle in 2007 about diabetes and gum disease. When one speaker listed foods to avoid, there was no mention of sugar. I thought this was very strange," Couzens said. She quit her job, exhausted her savings and spent 15 months scouring library archives. Then one day she found what she was looking for, in a cardboard box at the Colorado State University archives. What Couzens found was something food industry critics have been seeking for years - documents suggesting that the sugar industry used Big Tobacco tactics to deflect growing concern over the health effects of sugar. "So I had lists of their board reports, their financial statements, I had names of their scientific consultants, I had a list of research projects they funded, and I had these memos where they were describing how their PR men should handle conflict of interest questions from the press," she said. As Couzens sorted through the documents, the full extent of that campaign to forge public opinion emerged. The documents describe industry lobby efforts to sponsor scientific research, silence media reports critical of sugar, and block dietary guidelines to limit sugar consumption.