This app is specifically designed for Snack tracking study. Certain users (according to their eating habits) will be invited on another platform and if they wish to participant in this study they will sign a consent, and then use the app. If you participate in the study, every time you have a snack, you will have to record the occasion on your smartphone; all the information we would want is the location of where you had the snack (work/ study place, home or other) and the time (unless it is ‘now’). Note, we are only interested in snacks high in sugar, salt, or fat. Each of these responses should not take more than a few seconds.