APPetite: Validation of an app-based method for the remote measure of free-living subjective appetite.

Measures of appetite perceptions are often of interest when trying to understand dietary habits and eating behaviours. Typically, such measures are obtained using a pen and paper method, called the visual analogue scale technique. While this method has proved to be a valid, reliable method for measuring appetite in laboratory settings, we have developed a smartphone app, called APPetite, which we hope to use for measuring appetite outside of a laboratory. The purpose of this study is to determine the validity of APPetite, comparing appetite scores obtained using APPetite with those obtained with the established pen and paper method.