| Obesity is one of the leading preventable causes of death worldwide.[8][24][25] Large-scale American and European studies have found that mortality risk is lowest at a BMI of 20–25 kg/m2[23][26] in non-smokers and at 24–27 kg/m2 in current smokers, with risk increasing along with changes in either direction.[27][28] A BMI above 32 kg/m2 has been associated with a doubled mortality rate among women over a 16-year period.[29] In the United States obesity is estimated to cause 111,909 to 365,000 deaths per year,[2][25] while 1 million (7.7%) of deaths in Europe are attributed to excess weight.[30][31] On average, obesity reduces life expectancy by six to seven years,[2][32] a BMI of 30–35 kg/m2 reduces life expectancy by two to four years,[26] while severe obesity (BMI > 40 kg/m2) reduces life expectancy by ten years.[26] |
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