Being overweight can cost you life, according to a new study.

The result contradicts previous findings that demonstrated that a few extra pounds does not involve any greater risk.

According to the new study, published in the scientific journal The Lancet, is evidence that the risk of dying before the 70th anniversary increasing "steady and sharp" with an expanding waistline.

- On average, lose overweight about a year in the life expectancy, and moderately obese lose about three years, said Emanuele Di Angelantonio from Cambridge.

The study is based on a survey of 239 major studies between 1970 and 2015 in 32 countries and is based on data from 3.9 million, after including smokers and those who had a chronic condition at the beginning of the study have been deducted.

The study followed participants for an average of 14 years.

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