Why do many people try to have a healthy lifestyle?

I think most people nowadays are taking importance on their health because of longevity. And it is the fact that lifespan of human is being longer. If I live longer than I expect, I would like to have a happy life. It will be sad if I have poor health. I think the happiness depends on health, dream and love. And if someone has a good state of health, he or she may have physical strength or time to help someone. I\'m one of the people who tries to have a heathy lifestyle. I feel that what I ate makes myself. And I also become healthier after I started checking and controling the quality of the food. I recommend that you select healthier food when you are hungry. And prepare the meal yourself. It will be more tastier because you made it yourself. Treat yourself as you are an another person. (People are likely to treat themselves inhospitably I think) And do it continuously. It will make change today ,tomorrow, a month and whole life!