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Get advice from your midwife or GP if you're concerned about your weight. You should not use BMI as a measure if you're pregnant. For example, adults of South Asian origin may have a higher risk of some health problems, such as diabetes, with a BMI of 23, which is usually considered healthy. Your ethnic group can also affect your risk of some health conditions. BMI is applicable across most ethnicities and throughout the life cycle, Dietz elaborated, although correlations between total body fat and BMI may differ by sex and ethnicity. Muscle is much denser than fat, so very muscular people, such as heavyweight boxers, weight trainers and athletes, may be a healthy weight even though their BMI is classed as obese. Dietz explained that this is why the BMI calculation is weight (kg)/height (m) 2, which helps make BMI a stature-independent measure of weight. Accuracy of BMIīMI takes into account natural variations in body shape, giving a healthy weight range for a particular height.Īs well as measuring your BMI, healthcare professionals may take other factors into account when assessing if you're a healthy weight. If you want to calculate your BMI, you can use the healthy weight calculator. between 25 and 29.9 – you're in the overweight range.between 18.5 and 24.9 – you're in the healthy weight range.below 18.5 – you're in the underweight range.BMI rangesįor most adults, an ideal BMI is in the 18.5 to 24.9 range.įor children and young people aged 2 to 18, the BMI calculation takes into account age and gender as well as height and weight. The BMI calculation divides an adult's weight in kilograms by their height in metres squared. For example, white men have the lowest trajectories for weight gain, and Black women have the highest odds of developing obesity and higher BMIs 6 higher. The body mass index (BMI) is a measure that uses your height and weight to work out if your weight is healthy.