Extensive evidence has demonstrated that 24-hour dietary recalls provide the highest quality, least biased dietary data. Traditional 24-hour recalls, however, are expensive and impractical for large-scale research because they rely on trained interviewers and necessitate an extensive post-interview coding effort. These challenges are compounded by recommendations to collect multiple 24-hour dietary recalls for many research purposes. As a result, Researchers often make use of food frequency questionnaires, which are less expensive but contain substantial error.
To allow the use of 24-hour recalls in a wider range of research, investigators at the National Cancer Institute (NCI) created the Automated Self-Administered 24-hour (ASA24®) dietary recall system, a web-based tool that enables multiple, automatically coded, self-administered 24-hour recalls. The latest release, ASA24-2016, also permits researchers to collect data using single or multi-day food records, also known as food diaries. To learn more about 24-hour recalls and food records, visit the Dietary Assessment Primer.
The ASA24 system was developed under contract with Westat, a social science research firm, and originally based on an automated self-administered recall developed by Dr. Tom Baranowski of the Baylor College of Medicine.
The ASA24 system is freely available for use by researchers, clinicians, and teachers. The ASA24 system consists of a Respondent Website used to collect dietary intake data and a Researcher Website used to manage study logistics and obtain nutrient and food group data files. Learn more about the:
ASA24-2016 is the only version accessible from both desktop/laptop computers and mobile devices (e.g. tablets, smartphones). Adaptations of the ASA24 system have been developed for children and international versions are also available/under development. This website provides details on the ASA24 system and how to access and use it in your research.
A discussion forum for asking other researchers questions about how they are using ASA24.Join the ASA24 Listserv
- Evaluation & Validation
- ASA24 Versions:
- Respondent Website Demonstration Sites:
- System Requirements and Accessibility
- System Requirements
- Respondent Confidentiality
- Researcher Instructions:
- Sample Analysis Files and Data Dictionaries
Register to Use ASA24
- Join the ASA24 Listserv
- Frequently Asked Questions
- Considerations for Using ASA24
- Instructions for Study Staff & Participants
- Resources for Funding & Ethics Applications
- Reviewing & Cleaning Data
- Known Issues & Workarounds
- Resources Related to the Healthy Eating Index (HEI)
- Portion Size Image Database
- SAS Code for Updating Beta Output Files
ASA24 is a registered trademark of HHS.