By the ZIVOLABS Medical Team · Updated April 2026 · 6 min read

BMI is the starting point for almost every conversation about GLP-1 medication. It is the primary metric doctors use to assess eligibility — and in India, the thresholds are different from what you may have read in international sources. Here is what BMI actually measures, what the Indian-specific thresholds mean, and how to know whether you qualify.

What is BMI?

BMI stands for Body Mass Index. It is a number calculated from your height and weight that gives a rough indicator of whether your weight is in a healthy range for your height.

The formula is simple:

BMI = weight (kg) ÷ height (m)²

For example: a person who weighs 82 kg and is 1.68 m tall has a BMI of 82 ÷ (1.68 × 1.68) = 82 ÷ 2.82 = 29.1

You can calculate yours in under a minute with any BMI calculator — or simply divide your weight in kg by your height in metres, squared.

What does BMI actually measure — and what doesn't it tell you?

BMI is a screening tool, not a diagnostic one. It measures the ratio of weight to height. It does not directly measure body fat percentage, muscle mass, or where fat is distributed in the body.

This means:

BMI can underestimate risk. A person with a BMI of 24 but high abdominal fat — common in Indian adults — may carry significantly more metabolic risk than their BMI suggests. Central obesity (fat around the waist and abdomen) is a stronger predictor of insulin resistance, Type 2 diabetes, and cardiovascular disease than total BMI.

BMI can overestimate risk. A highly muscular person may have an elevated BMI that does not reflect excess body fat.

Waist circumference adds important information. Indian guidelines increasingly use waist circumference alongside BMI. Elevated risk is indicated at waist circumference above 90 cm in Indian men and above 80 cm in Indian women — thresholds that are lower than Western guidelines.

For GLP-1 prescribing purposes, BMI is the primary qualifying threshold — but your doctor will assess your full metabolic picture, not just this one number.

Why Indian BMI thresholds are different

If you have read international guidelines — from the WHO or the US FDA, for example — you may have seen GLP-1 eligibility thresholds of BMI 27 or 30. Indian thresholds are lower, and there is a well-established scientific reason for this.

Multiple decades of epidemiological research have shown that South Asians develop metabolic complications — insulin resistance, Type 2 diabetes, hypertension, cardiovascular disease — at lower BMI levels than populations of European descent. An Indian adult with a BMI of 25 carries roughly the same metabolic risk as a European adult with a BMI of 30.

This is explained by several factors including higher body fat percentage at equivalent BMI, tendency toward central fat distribution (abdominal fat), lower muscle mass relative to total weight, and genetic differences in insulin signalling.

Indian medical guidelines — including those from the Research Society for the Study of Diabetes in India (RSSDI) — have formally adopted lower BMI thresholds for defining overweight and obesity, and for recommending medical intervention.

Indian BMI categories and what they mean

Do you qualify for GLP-1 medication?

Here is the eligibility framework doctors use in India:

You qualify if your BMI is 27.5 or above — even without any other diagnosed condition. At this BMI, the metabolic risk is considered sufficient to justify medical intervention.

You qualify if your BMI is 23.0 or above AND you have at least one weight-related condition such as:

• Type 2 diabetes or pre-diabetes

• High blood pressure (hypertension)

• Abnormal cholesterol or triglycerides (dyslipidaemia)

• PCOD / PCOS

• Obstructive sleep apnoea

• Non-alcoholic fatty liver disease

• Cardiovascular disease

You qualify for diabetes treatment regardless of BMI if you have Type 2 diabetes — because semaglutide is approved as a diabetes medication independent of its weight management indication.

What if your BMI is close to the threshold?

Many people fall just below the qualifying BMI — at 26 or 27, for example — and wonder whether they can still access treatment.

A few important points:

BMI is measured from your actual weight, not your ideal weight. If you self-report weight rather than measuring accurately, minor discrepancies can affect the number. Measure on a calibrated scale, preferably in the morning before eating.

Waist circumference matters. If your BMI is 26 but your waist circumference is above 90 cm (men) or 80 cm (women), you may have a metabolic risk profile that justifies treatment despite the borderline BMI. Your doctor will assess this.

Undiagnosed conditions may qualify you. Many patients below the standalone BMI threshold have insulin resistance, borderline blood sugar, or other metabolic markers that have not yet been formally diagnosed. Your ZIVOLABS doctor may request specific bloodwork — fasting insulin, HbA1c, lipid profile — to assess your metabolic picture more fully.

Your doctor makes the final decision. BMI is a starting point. A qualified metabolic physician looks at your complete health profile, not a single number.

Calculating your BMI right now

Weight ÷ (height × height) = BMI

Frequently asked questions

My BMI is 24 and I have PCOD — do I qualify? Yes. PCOD is a qualifying weight-related comorbidity. With a BMI of 23 or above and a diagnosed comorbidity, you meet the eligibility criteria. A ZIVOLABS doctor will assess your full profile to confirm.

I have calculated my BMI as 28 but I feel like I am not overweight. Do I still qualify? BMI 28 in an Indian adult is in the Obese Class II category and does meet the standalone eligibility threshold. How you feel about your weight is separate from the medical and metabolic risk your BMI represents. Your doctor will discuss this with you.

Can children or teenagers access GLP-1 medication? No. Semaglutide is currently approved for adults only in India. It is not prescribed for patients under 18.

Does ethnicity affect my BMI threshold? The lower Indian thresholds apply to people of South Asian descent — Indian, Pakistani, Bangladeshi, Sri Lankan. If you are of a different ethnic background, your doctor will apply the appropriate guidelines for your population.

Find out if you qualify in under 10 minutes

Complete the ZIVOLABS health assessment and a doctor will review your BMI, health history, and metabolic profile to give you a clear, personalised eligibility answer.

[Check your eligibility →]

This article is for informational purposes only and does not constitute medical advice. Eligibility for GLP-1 medication must be confirmed by a qualified doctor. Individual health profiles vary.