the fact of a person's or an animal's body weight becoming less(人或动物)体重减轻
Weight loss can be achieved by balancing a healthy level of physical activity with eating a nutritious diet.减轻体重可以通过适当锻炼和营养用餐之间达成平衡来实现。
Such huge weight losses are not easy to sustain.这样大幅的体重减轻是不能持久的。