The more obese friends you have, the more likely you are to become obese, a new study suggests. This confirms previous research that gaining weight may be socially contagious.


The research also shows that if nothing changes significantly in the environment and culture in the USA, about 42% of adults will be obese in about 40 years and then the obesity rate will level off.


About a third of Americans are obese — that is, roughly 30 or more pounds over a healthy weight. Those extra pounds increase their risk of developing type 2 diabetes, heart disease and many types of cancer.
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