以"How to keep healthy"为题写一篇英语作文

How to Keep Your Health 一些内容参考了：
Does what I do really affect my health?
Very much so.All of the major causes of death--cancer,heart disease,stroke,lung disease and injury--can be prevented by things you do.
Don't smoke or use tobacco.
Using tobacco is one of the most dangerous things you can do.One out of every 6 deaths in the United States can be blamed on smoking.More preventable illnesses are caused by tobacco than by anything else.
Exercise can help prevent heart disease,high blood pressure,diabetes,osteoporosis,depression and,possibly,colon cancer,stroke and back injury.You'll also feel better and keep your weight under control if you exercise regularly.Try to exercise for 30 to 60 minutes,4 to 6 times a week,but any amount is better than none.