Define overweight and obesity.

Overweight and obesity are conditions characterized by an excessive amount of body fat, causing an individual to weigh more than what is considered healthy for their height and age. Overweight is typically defined as having a body mass index (BMI) between 25 and 29.9, while obesity is defined as having a BMI of 30 or higher. These conditions can lead to various health problems, including heart disease, diabetes, and high blood pressure.