Major increases in water demand, however, are being driven not merely by economic and demographic growth, or by the additional energy, manufacturing, and food production to meet rising consumption levels, but also by the fact that the global population is getting fatter. The average body mass index (BMI) of humans has been increasing in the post-World War II period, but especially since the 1980’s, with the prevalence of obesity doubling in the past three decades.
但是，水需求的大量增加并不仅仅是由经济和人口增长推动的，也不仅仅是由于满足消费水平升高而增加能源、制造品和食品产量导致的，全球人口越来越胖也是原因之一。人类平均体重指数（BMI）自二战结束以来节节上升，且自20世纪80年代以后加速增长，过去三十年中肥胖率翻了一番。