Final answer:
A person is considered obese if their body weight is above the average by 20%. Obesity is determined by the body mass index (BMI), and an adult with a BMI of 30 or higher is classified as obese.
Step-by-step explanation:
A person is considered obese if he or she has a body weight that is above the average weight for a person of a given height by 20%. Obesity is defined by the body mass index (BMI), which is a measure of weight in relation to height. An adult with a BMI of 30 or higher is considered obese. Obesity can lead to many health problems, such as diabetes, high blood pressure, and high cholesterol, and is often caused by a combination of overeating, poor diet, sedentary lifestyle, and genetic factors.