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Published26 minutes agoShareclose panelShare pageCopy linkAbout sharingImage source, Getty ImagesBy Philippa RoxbyHealth reporterMillions of middle-aged people have been mistakenly led to believe they are not obese, according to an Italian study that looked at body-fat percentage instead of body-mass index.Using a new, lower BMI cut-off for obesity would give a truer picture of who is affected, the researchers say.With age, muscle declines and fat builds up around organs in the waist region, often with no change in weight.The challenge is to find a tool that easily screens for obesity.BMI is calculated by dividing an adult’s weight in kilograms by the square of their height in metres.18.5-25 is said to suggest a healthy weight25-29 that they are overweight30 or above that they are obeseIt is a quick and easy method, supported by the World Health Organization,