Obesity is a medical condition characterized by excessive accumulation of body fat, which can lead to negative health consequences. It is typically defined by a body mass index (BMI) of 30 or higher, and can be caused by a combination of genetic, environmental, and lifestyle factors. Obesity increases the risk of developing a range of health problems, including heart disease, diabetes, high blood pressure, and certain types of cancer. It can also have a negative impact on mental health and quality of life. Treatment for obesity typically involves a combination of diet, exercise, and sometimes medication or surgery.