 The goal of the proposed research is to modify the Remote Food Photography Method RFPM for use with preschoolers. Primary caregivers the majority will be mothers and HS assistants will use a Smartphone to capture 24-hour images of HS childrens food selection and plate waste. The RFPM, Ecological Momentary Assessment EMA. and the Food Photography Application will be used to estimate the energy and nutrient intake of preschoolers. The accuracy of the RFPM will be examined by determining the energy and nutrient intake collectively referred to as food intake FI to established methods: 1 actual gram g weights of laboratory-based test meals and 2 doubly labeled water DLW in a natural environment. 