According to World Health Organization (WHO), worldwide obesity has nearly tripled since 1975. Almost 2 billion people are overweight. Unfortunately, over 340 million children and adolescents were overweight or obese. As World Health Organization and many scientific papers point out, obesity is preventable and treatable. This post provides a high-level view of key factors in prevention and treatment plans based on my research and experience. As obesity relates to many topics and disciplines, it is impossible to cover details in a single post. I plan a subsequent post to highlight the importance of obesity in physical and mental health.