Writing in the Public Library of Science journal PLoS Computational Biology, researchers expect the number of obese people in the United States to climb to 42% over the next 40 years.
In the study, a mathematical model was applied to four decades of data from the Framingham study; a long term study analyzing the health and habits of a town in Massachusetts.
The researchers say the friends you keep may explain the continued increase in obesity; an American has an additional 0.5% chance of becoming obese with each obese social contact, i.e. friend, they make per year.
Obesity and the desire to lose weight have created a huge weight-loss market in the United States. In 2003, a report claimed Americans spend between $40 and $100 billion on diet products every year.
According to a World Health Organization estimate, in 2007, 400 million adults were obese worldwide.
Image credit: Erupting Mind
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