以how to keep healthy为题目写篇作文要点一：合理饮食,多吃鱼,肉,豆类等.特别是新鲜蔬菜和水果,不要吃太多甜食.要点二：注意锻炼身体,劳逸结合,多参加体育活动.要点：保证充足睡眠,不熬夜,至少睡8hous/day.

To keep healthy,we should eat healthily.We should eat more fish,meat and bean,especially fresh vegetables and fruit.Never eat too much sweet food.
Also,We should pay attention to exercising every day.We should learn to have a rest.We should do sport more often.
Finally,we should sleep well.We shouldn't stay until midnight.We should sleep for at least eight hours every day.