The obesity epidemic began in the 1980s, and many people attribute it to increased portion sizes and inactivity, but that can't be everything.

肥胖在20世纪80年代开始蔓延，许多人将其归咎于食物份量增加和缺乏运动，但这不可能是全部原因。

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One likely reason: the obesity epidemic.

一种可能的原因是：肥胖。

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Societal reasons for the childhood obesity epidemic.

儿童期肥胖症流行的社会原因。

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To others,they are enemies of the public health in a time of what the World Health Organization calls a "global obesity epidemic."

VOA: special.2010.04.12

"So the combination of eating more calorie-dense food and having fewer opportunities for physical activity, that's what creates this obesity epidemic."

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And these markets are a way to help reduce the obesity epidemic affecting this country.

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Speaking of McDonald's, the fast food industry itself is being reshaped by the obesity epidemic.

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"It's as if the restaurant industry hasn't heard there is an obesity epidemic, " Wootan said.

CNN: 'Obesity on the menu' for kids, group says