A doctor will usually suggest that a person has obesity if they have a high body mass index. Body mass index (BMI) is a tool that doctors use to assess if a person is at an appropriate weight for their age, sex, and height. BMI measures weight related to height.

A BMI between 18-24.9 is normal; BMI between 25 and 29.9 indicates that a person is carrying excess weight. A BMI of 30 or over suggests that a person may have obesity and a BMI of 32.5 or more with associated comorbidities considered as morbidly obese.

For treating morbid obesity and its associated complications, however, the researchers recommend considering biologically based treatment, including Bariatric/ Metabolic/ Diabetes surgery where appropriate.