The emerging epidemic of overweight among underscores the need to identify contributing environmental factors. Marketplace trends for excessive and growing portion sizes in and outside the home have reinforced concerns that large portions may directly contribute by promoting excessive intake. To date, however, systematic investigation of portion size effects on children's eating has been extremely limited. Two laboratory studies have reported that serving large portions of macaroni and cheese to young children promoted energy consumption at meals. Whether portion size effects would be seen with other foods of varying energy content and preference is unknown. Of particular public health interest is whether serving large portions may affect children's intake of sweetened beverages, fruits and vegetables, and energy dense foods. This study will address these questions using an experimental approach to test the effects of portion size on children's eating.
