| | Conditions Treatments | Obesity How much do you have to weigh be considered obese? The definition of obesity is based on body mass index (BMI), which is a measure of weight relative to height. A BMI of 30 or higher is considered obese. Obesity - Related Articles Hand Sanitizer Safety About Carbohydrates Why were the medieval people angry after black death? Chronic Cluster Headache Relief Loratadine Alternatives Is medical assistant a good job? Is TAHBSO a major surgical procedure?