体重下降的关键是降低总卡路里的摄入或增加总卡路里的消耗或两者相结合。

And the key to losing weight involves either decreasing total calories consumed or increasing total calories burned or a combination of the two.

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而生产这些被浪费的卡路里要消耗美国总用水的25%以上，同时一年要用掉3亿桶油。

Producing these wasted calories accounts for more than one-quarter of America's consumption of freshwater, and also USES about 300m barrels of oil a year.

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