Obesity is a growing epidemic worldwide, affecting millions of people of all ages and backgrounds. According to the World Health Organization (WHO), over 1.9 billion adults were overweight and over 650 million were obese in 2016. This problem is not just limited to developed countries, as low- and middle-income countries are also experiencing a surge in obesity rates. The main causes of obesity include a sedentary lifestyle, unhealthy eating habits, genetics, medical conditions, and certain medications. Inactive lifestyle and overconsumption of high-calorie foods and beverages can lead to an energy imbalance, where the body stores excess calories as fat. Genetics can also play a role in obesity, as some people may have a predisposition to gaining weight due to their genes. Preventing obesity requires a combination of lifestyle changes, education, and public policy interventions. Adopting a healthy lifestyle, including regular exercise and a balanced diet, can help prevent obesity. Obesity is a serious global health issue that requires urgent action. The causes of obesity are multifactorial and include lifestyle factors, genetics, and medical conditions. The effects of obesity are far-reaching, affecting both physical and mental health, as well as economic outcomes. Prevention of obesity requires a comprehensive approach that addresses the root causes of the problem, promotes healthy behaviours and lifestyles, and creates supportive environments. By working together, we can fight this epidemic and build a healthier and happier world for all.