Short summary: New obesity frameworks are looking beyond BMI alone. BMI remains useful, but clinicians may also consider waist-based measurements, obesity-related health problems, and effects on daily function when assessing a person with diabetes.
Body mass index, or BMI, has been used for many years to screen for overweight and obesity. It is quick, familiar, and still part of routine clinical care. But BMI is only a rough measure. It does not show exactly how much body fat a person has, where that fat is stored, or how excess weight may be affecting health and daily life.
A review published in Nature Reviews Endocrinology on 21 July 2026 describes how several professional groups are developing more complete ways to assess obesity. The review brings together newer guidance and frameworks, including work from the European Association for the Study of Obesity and recommendations used in diabetes care.
Why are experts looking beyond BMI?
People with the same BMI can have very different amounts and distributions of body fat. They can also have different levels of health risk, physical ability, and obesity-related complications.
BMI does not distinguish between muscle and fat. It also does not capture central or abdominal fat particularly well, and it cannot by itself show whether a person has metabolic, physical, psychological, or functional effects related to obesity.
For people with diabetes, this broader picture matters. A clinician may need to consider blood glucose, blood pressure, cholesterol, sleep, mobility, joint symptoms, fatty liver disease, mental wellbeing, and other health factors alongside body measurements.
What might a fuller assessment include?
Newer frameworks generally combine several types of information rather than relying on one number. Depending on the clinical setting, this may include:
- BMI: still a useful screening and clinical measure.
- Waist-based measurements: such as waist circumference or waist-to-height ratio, which can provide information about central fat distribution.
- Health effects: including metabolic, physical, psychological, or functional problems associated with excess adiposity.
- Personal context: age, ethnicity, medical history, medicines, physical ability, and the person’s goals and preferences.
These measurements are not interchangeable, and different professional groups use somewhat different definitions and staging systems. The direction of travel is similar, however: assessment should reflect both adiposity and its effects on health rather than body size alone.
What does this mean for people with diabetes?
It means that a BMI result should be interpreted in context. A clinician may use BMI as a starting point and then add other measurements and a review of diabetes-related and obesity-related health problems.
This can support a more individualised conversation about goals. For one person, the main concern may be blood glucose or blood pressure. For another, it may be sleep, mobility, joint pain, fatty liver disease, or the ability to carry out daily activities. The most useful assessment is the one that considers the person’s overall health.
What these guidelines do not mean
BMI has not become useless, and people should not ignore it. A waist measurement on its own does not diagnose obesity or determine which treatment is right. These frameworks are intended to add clinical information, not to encourage self-diagnosis.
They also do not represent a new treatment trial. The recent Nature article is a synthesis of contemporary guidelines and evidence about assessment. It does not prove that one measurement or one treatment is best for every person with diabetes.
Questions to ask at your next appointment
- How should my BMI be interpreted alongside my other health measures?
- Would a waist measurement add useful information in my case?
- Are there diabetes, cardiovascular, sleep, liver, joint, or mobility concerns that should be assessed?
- What health goals should we track over time, beyond body weight?
The bottom line
BMI remains a useful starting point, but it does not tell the whole story. Newer obesity frameworks encourage clinicians to consider body-fat distribution, obesity-related complications, physical function, and overall wellbeing as part of a broader assessment.
These approaches are not yet standardised worldwide, and clinical practice is still adapting. If you have diabetes and questions about your weight, waist measurement, or health risks, discuss them with a qualified healthcare professional rather than trying to diagnose or stage obesity on your own.
Sources
- Nature Reviews Endocrinology: Diagnosis, staging and management of obesity: a synthesis of contemporary guidelines
- European Association for the Study of Obesity: A new framework for the diagnosis, staging and management of obesity in adults
- American Diabetes Association: Standards of Care in Diabetes 2026, Obesity and Weight Management
This article is for general education and does not replace personalised medical advice.