According to NHS, being slim with a big belly (or if you want to call it, a ‘spare tire’) can be more risky and deadlier than being obese. And the reason is that the belly fat may inflame vital organs.
Researchers focused on two types of measurement: body mass index (BMI) – which provides an assessment of overall body weight; and waist-to-hip ratio (WHR) – which is calculated by dividing the circumference of the waist by the circumference of the hips; this can provide an assessment of abdominal fat (belly fat). The conclusions were that people with a normal BMI but a large WHR had increased risk of dying during follow-up compared to people with a smaller WHR. This included people of similar BMI, and also people who were overweight or obese, but with a smaller WHR.
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