A highly regarded service that vets new studies for clinicians finds — on average — only 3,000 of 50,000 new journal articles published each year are well-designed and relevant enough to inform patient care. That's 6 percent.
More often than not, single studies contradict one another — such as the research on foods that cause or prevent cancer. The truth can be found somewhere in the totality of the research, but we report on every study in isolation underneath flip-flopping headlines. (Red wine will add years to your life one week, and kill you quicker the next.)