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Body Mass Index (BMI) is a simple screening tool that estimates body fat based on your height and weight. It is calculated by dividing your weight in pounds by your height in inches squared, then multiplying by 703.
Healthcare providers use BMI as a starting point to assess whether someone may be at increased risk for weight-related health conditions. It is widely used because it is quick, non-invasive, and easy to calculate at home.
BMI categories for adults are generally defined as:
BMI is a useful starting point, but it does not tell the whole story. It does not distinguish between muscle mass and fat mass, so someone who is very muscular may have a high BMI without carrying excess body fat.
It also does not account for where fat is stored. Visceral fat around the midsection carries more health risk than fat distributed elsewhere. Age, sex, and ethnicity can also influence what a healthy BMI range looks like for an individual.
BMI should be considered alongside other measures like waist circumference, body composition analysis, blood pressure, blood sugar levels, and cholesterol panels for a complete picture of metabolic health.
If your BMI falls outside the normal range, it may be worth having a conversation with a healthcare provider, especially if you are also experiencing:
A provider can help determine whether your BMI reflects a genuine health concern and recommend an appropriate course of action tailored to your situation.
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