Obesity is one of the biggest concern among people in Thailand and it has been a controversial issue for years. The number of people who become obese is increasing, particularly children and adolescents. Moreover, obesity is harmful to children’s health, their lifestyle and it might affect their future. In the past, people used to consume homemade food like rice and fresh produce which are traditional diet. While, fast food was not much well known in Thai eating tradition. Today, life changes and obesity is on the rise due to parenting, availability of unhealthy foods, lack of education and awareness, the reduction in the amount of physical activity and an increase in sedentary behavior.