What Class 3 obesity means
Class 3 obesity is the highest of the three obesity categories clinicians use, based on body mass index (BMI). It’s generally defined as a BMI of 40 or above — or 35 or above when someone also has a weight-related health condition. You may still hear the older label “morbid obesity,” but “Class 3 obesity” is the more neutral, current term.
BMI itself is a quick screening number calculated from height and weight. It’s useful for sorting risk across large groups, but it doesn’t measure body fat directly or account for muscle, so clinicians treat it as a starting point rather than a diagnosis on its own. Two people at the same BMI can carry very different amounts of adiposity.
Why it matters if you’re considering a GLP-1
BMI categories show up constantly in GLP-1 conversations because eligibility criteria are usually written around them. Many programs and insurers set a BMI threshold, then lower that threshold if you also have a qualifying comorbidity like type 2 diabetes, high blood pressure, or sleep apnea. Class 3 sits at the top of that scale, so it’s the tier least likely to run into eligibility friction — but plenty of people qualify well below it.
What to keep in mind
A BMI category is a label, not a verdict on your health or effort. It’s one input your clinician weighs alongside your medical history, related conditions, and goals. If you’re trying to figure out where you land, the eligibility checker can give you a rough sense, but the real assessment happens with a prescriber who can look at the whole picture. Learn more about the drug class on the GLP-1 overview.