The quality of the evidence for dietary advice given in UK national newspapers.

INTRODUCTION: Newspaper reports advocating dietary intake changes may impact on dietary choice and food related health beliefs. The scientific basis and quality of evidence underpinning these reports is uncertain. OBJECTIVE: To evaluate the scientific quality of newspaper reporting related to dietary advice. DESIGN: Articles offering dietary advice from the top ten selling UK newspapers for a randomly selected week were assessed using two established evidence grading scales: developed by the World Cancer Research Fund (WCRF) and the Scottish Intercollegiate Guidelines Network (SIGN). RESULTS: Of 111 dietary health claims identified, 72% and 68% (assessed by WCRF and SIGN criteria respectively) had levels of evidence lower than the convincing or probable categories that are recommended for dietary health claims. CONCLUSIONS: Misreporting of dietary advice by UK newspapers is widespread and may contribute to public misconceptions about food and health.