As societies have grown more prosperous and food more abundant, and a sedentary lifestyle has reduced our ability to expend energy, the weight of the general population in industrialized countries has gradually risen.
隨著社會富裕、食物豐盛，四體不勤的生活形態讓能量消耗相對降低，工業化國家的民眾，體重於是逐步上升。