Hudda's team derived an equation which uses height, weight, sex, age and ethnicity (if available) to estimate lean mass, which can be subtracted from weight to estimate fat mass testing showed that it estimated fat levels very accurately. "Our most recent research proposes an alternative method for assessing body fat in British children aged 4-15, based primarily on height and weight measurements." ![]() ![]() "However, this approach does not tackle the other limitations of BMI," states Hudda. Initially, it aimed to improve the assessment of body fat in children of different ethnic origins by making BMI adjustments in these children compared to white Europeans. Hudda's research focuses on finding better ways of using weight and height as a measure of body fat in children. In addition, research shows BMI is not a good measure of body fat in children of different ethnic origins, overestimating it in children of black African descent, and underestimating it in children of South Asian origins, compared to their white peers. "Secondly, the calculation can result in taller children having a higher BMI," continues the British Heart Foundation-funded researcher. "Firstly, as it is based on weight, it does not discriminate between the two components of weight: fat and lean mass, which can vary substantially between individuals with the same BMI. "BMI can provide inaccurate assessment of body fat levels, particularly in children, for several reasons," adds Mohammed Hudda, a Research Fellow in Epidemiology and Medical Statistics at St George's, University of London. "And young children naturally have different body compositions to adults, so standard BMI measurement can be inaccurate and should be age-adjusted as appropriate." If you are super fit and have a lot more muscle than average, for example, you may be classed as overweight or obese," explains Dr Sally Norton, an NHS weight loss consultant. ![]() "It's a reasonable measure - but not entirely accurate. Get advice from your midwife or GP if you're concerned about your weight.But BMI is not without its limitations. 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. 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. 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. ![]() The body mass index (BMI) is a measure that uses your height and weight to work out if your weight is healthy.
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