Nutrition research in recent years has been plagued by funding sources from Big Food companies and organizations. The media picks up on the headlines stating the benefits of a particular food that only supports the the food producer. This following article clearly states the problems and gives specific examples (under the graphics) of what the headlines may infer. What to do?
Be suspicious of media headings that claim a certain food confers some kind of health benefit.
Question the results from just one study. A major component of the scientific method is the ability to replicate the findings, i.e. several studies supporting the same conclusions.
If you read a study, look for the funding source and conflicts of interest of the authors.