What Does a ‘Healthy Weight’ Actually Mean?

“‘Healthy weight’ is not a single biological state — it’s a range that varies by individual physiology and context,” says Fatima Stanford, MD, MPH, an obesity medicine physician scientist at Massachusetts General Hospital in Boston.

In other words, a healthy weight for one person might not be healthy for someone else, given all these other factors (which are influenced by things like how well controlled someone’s blood sugar is, how active they are, diet, and even genetics).

Why Past Measures of ‘Healthy Weight’ Came Up Short

For decades, doctors used body mass index (BMI) to determine whether someone was at a healthy weight. But experts now warn that BMI alone isn’t very useful. “BMI is a blunt instrument with several well-established limitations,” Dr. Stanford says. Because of these disadvantages, health professionals are moving toward new definitions that incorporate other body measurements as well as weight, she explains.

BMI: Helpful as a Starting Point

‘Set Point’ Theory: Do Genetics Help Determine Weight?

Many experts believe your body has a preferred weight, or “set point.”

Rethinking How Doctors Define ‘Healthy Weight’

So, what is a better way to more accurately define what a “healthy weight” looks like in any one individual?

• People with stage 0 disease have no obesity-related health issues (comorbidities).
• People with stage 1 have some risk factors for obesity-related health issues and mild symptoms, such as borderline hypertension, prediabetes, or mild osteoarthritis.
• People with stage 2 have established comorbidities and moderate symptoms, such as hypertension, depression, or type 2 diabetes.
• People with stage 3 have significant obesity-related comorbidities that can reduce their quality of life, such as stroke, diabetic complications, or end-organ damage.
• People with stage 4 potentially have “end-stage disease” and may be bed- or wheelchair-bound with severe functional limitations and a significant reduction to their quality of life.

Doctors try to determine if a person has excess fat on an individual level and if they have an increased risk of diseases related to excess fat, Dr. Kumar says. The EOSS scale helps account for this. “Having excess fat mass is not inherently unhealthy for every individual. What matters is whether that fat is causing organ-level dysfunction, driving inflammation, impairing hormonal signaling, or reducing functional capacity,” she explains. Researchers are working to learn more about this, while also rethinking the tools they use.

These other measurements aren’t perfect, but they offer a more complete picture of how a person’s metabolic health is affecting their weight — and whether someone’s current weight can be considered a “healthy” one, Hashmi says.

Waist Measurements

Body Composition Analysis

Functional Capacity

Certain functional markers can help doctors determine how your weight impacts your health. “[For example,] can you climb four flights of stairs without losing your breath? Can you carry your body weight through daily life without joint pain?” Kumar says. Your ability to complete certain everyday activities without straining means you can add more movement into your routine, which helps you maintain a healthy weight.

To determine your functional capacity, your doctor may have you complete certain tasks during your visit, or they may ask questions about how easy these tasks are.

Metabolic Vital Signs

Vital signs, including your blood pressure, blood sugar, and cholesterol levels, offer further insight into your metabolic health.

• A normal blood pressure is a systolic reading (the top number) of less than 120 millimeters of mercury (mmHg) and a diastolic reading (the bottom number) of less than 80 mmHg.

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• A normal blood sugar level using an A1C blood test is below 5.7 percent.

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• Normal cholesterol levels include a total cholesterol level below 200, a low-density lipoprotein (LDL) level below 100, and a high-density lipoprotein (HDL) cholesterol level of 40 or above for men and 50 or above for women.

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Enter ‘Metabolic Phenotyping’

Incorporating all these other measurements characterizes a shift by the medical field away from determining health using only someone’s weight, and toward metabolic phenotyping, Kumar explains.

Some commercially available products that have you swab the inside of your cheek and mail in the sample for analysis might give you information on your metabolic phenotype. But the results may not use standardized language, and the type of information you get may vary depending on which test you order. It’s important to speak with an obesity medicine expert before ordering one of these tests, as they can help you determine whether this would be helpful for you personally. If you do order a test, your provider can help you understand what the results mean for your health.

So, How Do You Determine What’s a ‘Healthy Weight’ for You?

Finding the answer to this question can be frustrating, given recent shifts in how we think about and define healthy weight. A conversation with your doctor can help.

If your doctor usually focuses on BMI alone, Kumar suggests telling them that you want to understand your metabolic health, not just your weight class. She also recommends asking for a fasting insulin test and a lipid panel with particle fractionation (a detailed report about your cholesterol), and discussing your waist circumference in the context of your height.

It can also be helpful to watch for certain warning signs that your weight is negatively affecting your health — such as fatigue after meals, poor sleep, worsening inflammation, declining exercise tolerance, and shifts in your menstrual cycle — Kumar says.