The European Federation of the Associations of Dietitians (EFAD) supports the AllTrials campaign for all clinical trials to be registered and all results to be reported. EFAD believes that good nutrition plays an important role in society, both in maintaining health and aiding recovery from disease. EFAD also advocates for all dietetic practice to be evidence based. This is only possible if all the evidence from all the trials is available to dietitians and policy makers. Without access to all the evidence dietitians cannot offer the best dietary advice to improve both individuals’ and the population’s health or make informed decisions about which health policies to promote.