First of all, a balanced diet is necessary. Foods like fresh vegetables, fruits, dairy products and cereals keep us healthy. Secondly, a good sleep is very important, because it makes us full of energy all day. Third, do some sports and come to stay away from obesity. Running and ball games may be a good choice. Last but not least, with a good attitude, you will enjoy life more easily.
According to what I mentioned above, I believe you can live a healthy life.