Final answer:
Obesity is having a high percentage of body fat and is associated with various health problems. Middle-aged adults who are overweight have an increased risk of fatal heart attack.
Step-by-step explanation:
Obesity is having a very high percentage of body fat and is measured using the body mass index (BMI). Being overweight or obese can lead to various health problems such as diabetes, high blood pressure, and high cholesterol. Middle-aged adults who are overweight have an increased risk of having a fatal heart attack. Additionally, excess body weight can contribute to cardiovascular disease, diabetes, osteoarthritis, and some types of cancer.