A recent report in the Journal of the American Medical Association (JAMA) suggests that the sugar industry played a role in influencing dietary research and dietary recommendation in the 1960s. Not only did the Sugar Research Foundation fund the research in question, but according to the report they also may have influenced the direction and findings of said research. This was at a pivotal time when there was lots of discussion about heart disease and what role diet might play.
Read the full report in JAMA
Read a summary of report
How the Sugar Industry Shifted Blame to Fat (New York Times)