Rajiv Chowdury, a research associate from the Department of Public Health and Primary Care at the University of Cambridge, explains why eating whole fish is better than fish oil - at least when it comes to cerebrovascular disease. Also this week Peter Doshi and Tom Jefferson from the Cochrane Collaboration talk about the BMJ's open data campaign, and how publishing correspondence with Roche, the WHO and Centers for Disease Control and Prevention might reveal the missing data on Tamiflu.