Excessive body weight due to fat is called obesity. Obesity is a medical condition that occurs when an individual's body weight is significantly higher than what is considered healthy for their age, height, and sex. It is caused by the accumulation of excessive body fat, which can have negative effects on an individual's overall health and well-being. Obesity is typically diagnosed using a measurement called Body Mass Index (BMI), which is calculated by dividing an individual's weight in kilograms by their height in meters squared. A BMI of 30 or higher is considered obese. Obesity is a serious health concern as it increases the risk of developing a wide range of health problems, such as type 2 diabetes, heart disease, high blood pressure, and certain cancers.