Obesity is a condition characterized by excessive accumulation of body fat and weight gain. Obesity is defined when a person's body mass index (BMI) is 30 or higher. BMI is calculated based on a person's height and weight.

Obesity often arises from a combination of factors including overeating habits, low levels of physical activity, genetic factors, hormonal imbalances, and environmental influences. Obesity has been associated with a range of health problems, including type 2 diabetes, heart disease, high blood pressure, stroke, joint problems, sleep apnea, depression, and certain types of cancer.

Treatment for obesity involves methods to promote weight loss and encourage a healthy lifestyle, including diet, exercise, lifestyle changes, and sometimes surgical interventions. Treatment is typically individualized and requires a multidisciplinary approach.