Experts have cautioned against excess weight around the waist which increases health risks.
Three leading UK charities are launching a new Active Fat campaign to raise awareness of the dangers, after it was seen that most people do not realise that their spare tyre puts them at increased risk of cancer, diabetes and heart disease.
AdvertisementThe poll on 2,085 people showed that in all, 97 percent of people were unaware of a link despite 71 percent of those surveyed saying they had an expanding waistline.
Excess weight around the middle generates oestrogen and excess chemicals in the stomach, which put people at higher risk of killer diseases.
Women are at risk of Type 2 diabetes and heart disease if their waist measures more than 80cm (31.5 inches) while men are at risk at more than 94cm (37 inches).
"That 'harmless' spare tyre around your waist is actually a major health hazard," the BBC quoted Dr Mike Knapton, of the British Heart Foundation charity which is working alongside Cancer Research UK and Diabetes UK, as saying.
"While you might be relaxing at home, your fat cells are working overtime to pump out excess hormones and other chemicals that can cause disease.
"Wrapping a tape measure around your middle takes just a few seconds, but it could be your vital first step towards a healthier future," he said.
Waist size is likely to increase throughout life, but many are in denial about their spare tyre, say the charities.
In the poll, women were less likely than men to worry about the health consequences of their muffin top and instead were more concerned with how they looked and whether they could fit into their clothes.
Less than half of men and women (44 percent) had tried to do more exercise as a way to avoid going up in belt size, while some 27 percent of people bought bigger sized clothes.
As part of the campaign, the charities are calling for standard labelling on foods, highlighting the "traffic lights" system for nutrition.
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