"变健康"在英语中可以说成"become healthy"或"improve one's health".
这个短语来源于英语中"become"和"healthy"两个单词的组合，"become"表示变为，"healthy"表示健康。
例句1：
John wants to become healthy, so he started to eat more fruits and vegetables.
约翰想变健康，所以他开始吃更多的水果和蔬菜。
例句2：
She has been working hard to improve her health by exercising every day.
她一直在努力锻炼，以改善她的健康状况。