In recent years, childhood obesity has become a serious problem all around the world and has attracted more and more people’s attention. The problem of childhood obesity is becoming increasingly worrisome (Geier, Foster, Womble, Mclaughlin, Borradaile, Nachmani, Shults, 2007); The primary reason is an unhealthy lifestyle so this paragraph will show the same lifestyle between Americans and Vietnamese and the reason why more and more obese children emerge in these two countries. Children in these two countries have the same hobby. Hartmann (2015) suggests that there are many children prefer eating unhealthy food and physical inactivity in United States and Vietnam. For example, it suggests that children always eat nutrient-poor foods and fast foods that contain much sugar, salt and calories in USA (Latham,2004).…