One likely reason: the obesity epidemic.

一种可能的原因是：肥胖。

Societal reasons for the childhood obesity epidemic.

儿童期肥胖症流行的社会原因。

AMERICA's obesity epidemic is so called for a reason.

说美国流行肥胖自有其原因。

Could it be that the American obesity epidemic has reached a plateau?

可以认为美国肥胖病已经到了一个平台了么？

They therefore require special attention when fighting the obesity epidemic.

因此，在与肥胖症流行进行斗争时，他们需要获得特别重视。