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Clean air has a positive effect on life expectancy
September 9, 2009
Clean air has a positive effect on life expectancy
Reducing air pollution contributed to an increase in the average of five months of life expectancy of people in dozens of American cities over the past two decades, writes The Washington Post, citing figures from the study.
Researchers from Brigham Young University and Harvard came to this conclusion based on the change in air quality and life expectancy for the period from 1980 to 2000 in 51 U.S. city, including Washington. Taking into account the impact on life expectancy of other factors, such as changes in population, income and education, as well as migration and smoking, they concluded that clean air contributes significantly to the increase in life expectancy.
Thus, the first time scientists have documented the relationship between air quality and long life, says author Juliet Eylperin.
The researchers concluded that the whole country, life expectancy of citizens has increased from 1980 to 2000 an average of 2.72 years? and five months of this period due to improved air quality.
“Our investments paid off,” – noted the study’s lead author Arden Pope, an epidemiologist and professor of economics at Brigham Young University. He added that reducing pollution in major cities has become “a major, nationwide, a natural experiment.”
The U.S. has stabilized the level of obesity
September 27, 2008
The U.S. has stabilized the level of obesity
The level of obesity in the U.S. stabilized after 25 years of uninterrupted growth, reports Reuters.
In the 2005-2006 year, there were about 72 million people suffering from obesity, about the same as in 2003-2004, said the record U.S. Centers for Disease Control and Prevention (Centers for Disease Control and Prevention, CDC). However, the problem of obesity is still very relevant: more than a third of adult Americans suffer from the disease, experts indicate CDC.
«The lack of significant growth in the level of obesity in the last few years is encouraging. But we have not seen and to reduce the target », – said CDC epidemiologist Cynthia Ogden (Cynthia Ogden).
Diagnosis «obesity» put at BMI equal to 30 or more. Body mass index (BMI) is calculated by dividing weight in kilograms by the square of height in meters. A sign of normal weight is considered BMI of 18.5 – 25 units.
According CDC, the U.S. suffers from obesity 35.3% women and 33.3% of men. Despite the fact that obesity is more common among women, the gender gap is gradually narrowing. Ogden said that the country’s tendency to increase the level of obesity in men: in 1999 the proportion of american womens with pathological increase in body weight remained almost unchanged, while the rate of obesity among men has increased steadily.
The most common obesity affects people aged 40-59 years. In this age category, it noted 40% of men and 41% of women, experts indicate CDC.
The report notes that among the different races and ethnic groups living in the United States, the prevalence of obesity is different. The highest rates of obesity observed among american black womens and american womens Mexican origin – respectively 53% and 51% of women in the age group from 40 to 59 years.
Meanwhile, obesity is a risk factor for many diseases, in particular, type 2 diabetes, some cancers, as well as cardiovascular diseases, experts indicate.