开篇引入
"What is the most important thing in the world？ I think it is health."
"As we all know, healthy is very important to everybody. But do you really know how to stay healthy？"
锻炼的重要性
"First, we should do exercise if we have time. For example, we can go swimming in the summer holiday. Or we can take a walk after supper. Doing exercise makes us healthy and strong."
"First, it is absolutely necessary to take some exercise every day. Research shows that getting plenty of exercise makes the heart beat faster and the lungs work harder."
"In order to eat healthily I usually avoid eating food high in fat like French fries or cookies. I also eat little meat to keep me healthy. What's more, I think friends are an important part of one's health. Many studies show that people with a wide range of social contacts get sick less than those who don't."
饮食建议
"Second, we should take more vegetables and fruit and less candies. Stop eating junk food to have a healthier body."
"In order to eat healthily I usually avoid eating food high in fat like French fries or cookies. I also eat little meat to keep me healthy."
"均衡的饮食很重要。你最好吃足够的蔬菜，因为它包含丰富的维生素。适量的肉类也是需要的。避免油炸和烤制食品。"
心理健康
"Keeping good emotions is very important for mental health. We should have new thoughts and release stress so that we can have a good attitude towards life."
总结
"I wish everybody has a strong and healthy body."
"That is why we always try to eat in a healthy way and exercise regularly."
通过以上这些表达，你可以写出一篇关于如何保持健康的英语作文。希望这些建议对你有所帮助!