BMI Thresholds and How Prescribers Use Them
BMI — Body Mass Index — is a number calculated from your height and weight. It is one of the criteria prescribers commonly use when assessing whether Mounjaro is suitable for a patient, though it is rarely the only factor considered.
Commonly referenced thresholds
- BMI 30 or above (obesity range): the threshold most commonly cited in prescribing guidance for Mounjaro as a weight-management medicine.
- BMI 27 or above (overweight range with a comorbidity): a lower threshold that may apply when the patient also has a weight-related condition such as type 2 diabetes, high blood pressure, or high cholesterol. Your prescriber will assess which category applies to you.
It is worth noting that BMI is a broad population-level measure with well-recognised limitations — it does not account for muscle mass, ethnicity-related risk factors, age, or how weight is distributed. Prescribers consider it alongside a fuller clinical picture, not in isolation.
For a deeper look at how BMI relates to eligibility, see our page on BMI and Mounjaro eligibility, or explore the minimum BMI needed for Mounjaro in more detail.
Eligibility guidelines can also differ depending on the healthcare system or setting you are in. Always defer to what your own prescriber or doctor has told you — they have assessed your individual circumstances and local clinical criteria.
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Once you are prescribed Mounjaro, watching how your BMI changes over time becomes a meaningful part of the journey — and that is where GLP Trackr can help.
The app's weight and body tracking feature lets you log your weight regularly and see week-by-week trend charts, so you can watch your numbers move in a clear, visual way rather than relying on memory or scattered notes. Pair that with the daily check-in — a 30-second log of weight, energy, and mood — and you build a consistent record that reflects far more than the scale alone.
For ongoing context, our BMI and Mounjaro overview covers what the number means across your treatment, and the calorie and nutrition calculator hub brings together the tracking tools most useful for people on a GLP-1 journey.
Any questions about whether your BMI or weight progress affects your ongoing prescription should always be discussed with your prescriber or doctor — GLP Trackr records your data so you can have better-informed conversations with them, not as a substitute for their guidance.
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Frequently asked questions.
Mounjaro is commonly prescribed for adults with a BMI of 30 or above, or a BMI of 27 or above if a weight-related health condition is also present. Exact criteria depend on your location and prescriber, who will assess your full clinical picture.
In some cases, a BMI of 27 or above may be sufficient if a weight-related comorbidity — such as type 2 diabetes or high blood pressure — is also present. Whether this applies to you is a decision for your prescriber or doctor, not something to determine from BMI alone.
No. BMI is one criterion, but prescribers also consider overall health, existing conditions, medications, and individual risk factors. BMI has recognised limitations as a measure, so it is assessed alongside a broader clinical evaluation.
GLP Trackr lets you log your weight regularly and view trend charts over time, giving you a clear picture of how your numbers are shifting. You can also record mood, energy, and other daily metrics to capture the full scope of your progress.
Questions about how your current BMI or weight progress affects your prescription should always go to your prescriber or doctor. They can review your progress and advise on next steps — GLP Trackr helps you bring clear, organised data to those conversations.