Skip to main content

01.12.2015 | Study protocol | Ausgabe 1/2016 Open Access

BMC Public Health 1/2016

Protocol for a cluster-randomised trial to determine the effects of advocacy actions on the salt content of processed foods

BMC Public Health > Ausgabe 1/2016
Helen Trevena, Anne Marie Thow, Elizabeth Dunford, Jason H. Y. Wu, Bruce Neal
Wichtige Hinweise

Electronic supplementary material

The online version of this article (doi:10.​1186/​s12889-016-2743-4) contains supplementary material, which is available to authorized users.

Competing interests

HT is a research assistant, ED is the research officer, and BN is the chairman of the Australian Division of World Action on Salt & Health (AWASH). The other authors’ declare that they have no competing interests.

Authors’ contributions

BN conceived of the study, HT and BN designed the overall study, Anne-Marie Thow (AMT) provided input and guidance to the design of the intervention program and theory of change, Jason H Y Wu (JW) participated in the data analysis design. HT wrote the first draft. All authors were involved in the critical revisions of the manuscript for important intellectual content and approved the final manuscript for submission. HT had primary responsibility for the final content.



Corporate decisions affecting the composition of processed foods are a potent factor shaping the nutritional quality of the food supply. The addition of large quantities of salt to foods is incompatible with Australian Dietary Guidelines and the reformulation of processed foods to have less salt is a focus of non-governmental organisations (NGOs). There is evidence that advocacy can influence corporate behaviour but there are few data to define the effects of NGOs working in the food space. The aim of this study is to quantify the effects of advocacy delivered by a local NGO on the salt content of food products produced or marketed by companies in Australia.


This is a cluster-randomised controlled trial that will be done in Australia from 2013 to 2015 which includes 45 food companies. The 23 companies in the control group will receive no specific intervention whilst the 22 companies in the intervention group will receive an advocacy program based upon an established theory of change model. The primary outcome will be the mean change in sodium content (mg/100 g) of processed foods produced or marketed by intervention compared to control companies assessed at 24 months. Interim outcomes (statements of support, published nutrition policies, level of engagement, knowledge and use of technology to reduce salt, salt reduction plans, and support for national initiatives) will also be assessed and a qualitative evaluation will provide more detailed insight.


This novel study will provide robust randomised evidence about the effects of advocacy on food company behaviour and the quality of the processed food supply. A finding of improved food company behaviour will highlight the potential for greater investment in advocacy whilst the opposite result will reinforce the importance of government-led initiatives for the improvement of the food supply.

Trial registration NCT02373423. 26/02/2015
Über diesen Artikel

Weitere Artikel der Ausgabe 1/2016

BMC Public Health 1/2016 Zur Ausgabe