Bi Project Policy Area: Health
BI Project
Can Visual Cues to Portion Size Reduce the Number of Portions of Consumed? Two Randomized Controlled…
Methods
Two preregistered randomized controlled trials (N = 253 and N = 674) measured consumption in a lab and the home environment. Cues were salient, labeled stripes that demarcated single portions. Participants were randomized to cue condition or control. Consumption was measured without awareness.
Results
The main preregistered effect of the visual cue was not statistically significant. There was some variation by subgroup. In Study 1, men were more likely to eat the whole can of potato…
Contact-tracing mobile phone apps have the potential to play a role in controlling
the spread of COVID-19, but their success hinges on widespread uptake by the public. We
report a study that behaviourally pre-tested COVID Tracker, Ireland’s contact-tracing app,
prior to its launch with a large sample of smartphone users. The study was funded by the
Department of Health and run in co-operation with the app’s developers, NearForm.
Participants were randomised to receive different versions of a…