Good health enables us to enjoy our life and achieve what we hope for in our career. On the contrary, poor health tends to deprive us of our interest in everything around us. How to stay healthy concerns everyone, though we have advanced medicine. When we discuss this, some fundamental principles should be brought in mind. 　　
Firstly, it is very important for us to take more fruits and vegetables because they provide vitamins and they help in the process of digestion. Secondly, we have to keep a balanced diet and maintain regular eating habits. Proper nutrition is important for good health. Avoid food with lots of sugar and fat. Eat plenty of foods high in protein. Thirdly, we’d better do morning exercise every day, do sports frequently to make our bodies strong. Besides, we have to avoid too much work pressure. Getting too tired all the time may definitely weaken our defense system, making us get sick easily. Finally, we have to get rid of those bad habits that damage our health, such as drinking and smoking. 　
Since a sick person tends to be unhappy, people worldwide have spared no efforts to slay healthy. They pay special attention to what they eat so that they get neither malnourished nor overweight. Besides, people, especially, those engaged in mental jobs, create numerous indoor or outdoor exercises to keep energetic, eg. working in the field as gardeners and farmers, going to work on foot, cycling to work, having a walk after supper, climbing mountains, traveling, attending all kinds exercises in health clubs, etc. 　　To be healthy also includes being mentally healthy. It is another important guaranty for people to live or work well. So, experts suggest that we keep a calm, peaceful and open mind and try to avoid extreme emotions like fierce anger, extreme sadness and excitement.
In conclusion, if we stick to things according to the aspects mentioned above, we‘ll lead a healthy life and become as fit as a fiddle.