Drinking yoghourt before lunch was all the go.

午餐前喝酸奶曾经一度流行。

　　all the go在这里是“流行”的意思。 例句：For a while rock'n'roll was all the go；then it was replaced by R & B．　　摇滚乐曾经一度流行，但很快就被蓝调音乐取代。