“…These methods are speedy and inexpensive, but they rely on children's memory and mental images induced by food names. Noble, Corney, Eves, Kipps, and Lumbers (2000) used photographs of foods commonly served at school lunch as stimuli, but for preschool children, photographs do not reliably represent real foods (Guthrie, Rapport, & Wardle, 2000). The observation method represents the best approach to study what children consume (Salvy et al, 2008;Simons-Morton et al, 1992), and observations can be very helpful in validating indirect methods and confirming children's reports of portion size (Baxter et al, 2000).…”