How BMI Factors Into Mounjaro Prescribing
Body Mass Index (BMI) is a simple ratio of weight to height, calculated as weight in kilograms divided by height in metres squared. It gives a broad indication of whether someone is in an underweight, healthy, overweight, or obese range — and it has historically been used as a starting point for prescribing eligibility assessments for weight-management medicines.
Why a BMI threshold is used
Prescribers use BMI thresholds because clinical trials and regulatory assessments for medicines like Mounjaro are conducted in populations defined partly by BMI. In many settings, a BMI of 30 or above — or 28 or above when conditions such as type 2 diabetes, high blood pressure, or raised cholesterol are present — has been used as a reference point. A full overview of Mounjaro BMI criteria explains what these thresholds represent and why they vary.
BMI 28 and Mounjaro
You may have come across the figure of BMI 28 in the context of Mounjaro eligibility. Some prescribing pathways and clinical guidelines reference a lower BMI threshold — sometimes as low as 27 or 28 — when a person has additional weight-related health conditions. Whether this applies to you is a decision only your prescriber can make, based on your complete medical history. For a closer look at this specific threshold, see how BMI and Mounjaro prescribing connect in practice.
BMI is a starting point, not the whole picture
BMI does not capture body composition, muscle mass, fat distribution, ethnicity-related risk differences, or overall health. Most prescribers use it alongside other measures — waist circumference, blood markers, existing health conditions, and personal circumstances. If you have questions about your own eligibility or ongoing suitability, your prescriber or doctor is the right person to ask. You can also review what the broader Mounjaro BMI requirements involve for a more detailed breakdown.
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Once you are prescribed Mounjaro, watching how your weight — and therefore your BMI — changes over time becomes a meaningful part of your journey. GLP Trackr's weight and body tracking feature lets you log your weight regularly and see your progress plotted as a clear chart, so trends become visible rather than guesswork.
Beyond the scale, the app's daily check-in captures mood, energy, and sleep alongside your weight each morning — giving you a fuller picture of how you are feeling, not just what the numbers say. And when you sit down with your prescriber to review your progress, the insights and doctor report feature means you can bring a clear, organised summary of your journey rather than relying on memory.
To put your logged weight in context, explore the broader tools and guidance available via the GLP Trackr calorie and nutrition calculator hub, where you can connect your weight tracking to your food and calorie goals.
GLP Trackr helps you record your progress so you can discuss it meaningfully with your prescriber — it is not a substitute for their clinical judgement, and any decisions about your treatment should always be made with their guidance.
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Frequently asked questions.
Prescribing criteria commonly reference a BMI of 30 or above, or around 27–28 and above when weight-related health conditions are present. The exact threshold depends on your prescriber and local guidelines — only your prescriber or doctor can confirm whether you meet the criteria.
Some prescribing pathways do reference a BMI as low as 27 or 28 when additional weight-related conditions such as type 2 diabetes or high blood pressure are present. Whether this applies to your situation is a decision for your prescriber, based on your full medical history.
BMI is calculated by dividing your weight in kilograms by your height in metres squared. For example, a person weighing 90 kg at 1.75 m has a BMI of approximately 29.4. It is a general screening tool and does not account for body composition or other individual health factors.
Because BMI is directly linked to weight, it will change as your weight changes during treatment. Many people on Mounjaro track their weight regularly to see how their BMI shifts over time — a weight-logging app like GLP Trackr can make this easy to visualise.
GLP Trackr lets you log your weight at regular intervals and displays your progress as a chart over time. Because BMI is calculated from weight and height, watching your weight trend gives you a clear proxy for how your BMI is moving — all in one place.