The term SERIOUSLY OVERWEIGHT can be summarized as OBESE, which is a medical term used to describe someone who is significantly above their ideal body weight. This is usually determined by calculating the person's body mass index (BMI), which is a measure of body fat based on height and weight. People who are considered OBESE have a BMI of 30 or higher. Being seriously overweight can lead to a variety of health problems, including heart disease, stroke, diabetes, and certain types of cancer.