At present rising of obesity becomes a principal public global health and economic concern. In 1997, the World Health Organization (WHO) has declared the obesity as global epidemic. About one-third of the world population is now suffering from overweight or obesity. It is estimated that some diseases, such as hypertension, cardiovascular diseases, Alzheimer disease, asthma, metabolic syndrome, liver steatosis, gallbladder disease, osteoarthritis, obstructive sleep apnea, certain types of cancer, hypercholesterolemia, metabolic syndrome, musculoskeletal disorders (joint and muscle pains), and type 2 diabetes are increased globally due to obesity. Obesity can affect nearly every organ system of human body and even may cause of total heart failure. On the other hand, obesity is incurring substantial costs for healthcare that are already affected the society. Obesity can be prevented, avoided, and cured. Prevention of obesity is the best policy, but proper treatment is necessary who are already affected with obesity. This article tries to discuss aspects of obesity, such as causes and prevention of obesity.