The weight just piled on while I was abroad. 我出国期间体重一个劲地增加.

pile on: (especially of a person's weight 尤指体重) to increase quickly 剧增;猛增

People regularly fail to think about what they are eating and many are piling on the pounds as a result, study showed.

调查显示,人们往往不去想自己究竟在吃些什么,所以许多人因此而长胖.