A new study reports that more than two billion adults and children across the globe are overweight or obese, and suffer from related health problems. Spurred by poor nutrition and low levels of physical activity, this number equates to one-third of the world’s population.

While 2.2 billion people can be classified as overweight or obese, more than 710 million are obese: 5% of all children, and 12% of all adults, can be categorized in this segment. The United States has the greatest percentage of obese or overweight children and young adults, at 13%.

The study, published in the New England Journal of Medicine, states that a growing number of people across the globe are dying from poor health, and problems linked to being overweight. “People who shrug off weight gain do so at their own risk–risk of cardiovascular disease, diabetes, cancer, and other life-threatening conditions,” said Dr. Christopher Murray, director of the Institute for Health Metrics and evaluation at the University of Washington, who worked on the study.

Researchers analyzed data collected between 1980 and 2015 from 68.5 billion people, and revealed that the number of people affected by obesity has doubled since 1980 in 73 countries, and continued to rise across most other countries in the analysis. Although the percentages of obese children were lower than adults, that rate at which their numbers have increased was greater–indicating greater future risk if nothing is done to alleviate and curb the growing problem.

“This raises the alarm that we may be facing a wave of obesity in the coming years across high and low income countries,” states Goodarz Danaei, assistant professor of global health at the Harvard T.H. Chan School of Public Health. Because obesity levels have risen in all countries, irrespective of income levels, the issue does not simply boil down to wealth. The paper reads: “Changes in the food environment and food systems are probably major drivers.”

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