Obesity has emerged as a global health epidemic.
Obesity worldwide is increasing more quickly in rural areas than in cities, a study reported Wednesday, challenging a long-held assumption that the global epidemic of excess weight is mainly an urban problem.
Data covering 200 countries and territories compiled by more than 1,000 researchers showed an average gain of roughly five to six kilos per woman and man living in the countryside from 1985 to 2017.
City-dwelling women and men, however, put on 38 and 24 percent less, respectively, than their rural counterparts over the same period, according to the findings, published in Nature.
"The results of this massive global study overturn commonly held perceptions that more people living in cities is the main cause of the global rise in obesity," said senior author Majid Ezzati, a professor at Imperial College London's School of Public health.
"This means that we need to rethink how we tackle this global health problem."
Obesity has emerged as a global health epidemic, driving rising rates of heart disease, stroke, diabetes and a host of cancers.
Approximately two billion adults in the world are overweight, nearly a third of them obese.
To factor health status into the comparison across nations, the researchers used a standard measure known as the "body-mass index", or BMI, based on height and weight.
A person with a BMI of 25 or more is considered overweight, while 30 or higher is obese. A healthy BMI ranges from 18.5 to 24.9.
The number of obese people has tripled since 1975.
The study revealed important differences between countries depending on income level.
In high-income nations, for example, the study found that rural BMI were generally already higher in 1985, especially for women.
The most urbanised regions in the world are North America (82 percent), Latin America and the Caribbean (81 percent) and Europe (74 percent).
More recently, the proportion of overweight and obese adults in the rural parts of many low- and middle-income countries is also rising more quickly than in cites.
Some of the largest BMI increases from 1985 to 2017 among men were in China, the United States, Bahrain, Peru and the Dominican Republic, adding an average of 8-9 kilos per adult.
Women in Egypt and Honduras added -- on average, across urban and rural areas -- even more.
Rural women in Bangladesh, and men living in rural Ethiopia, had the lowest average BMI in 1985, at 17.7 and 18.4 respectively, just under the threshold of healthy weight. Both cohorts were well above that threshold by 2017.
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