Health insurance is familiar for us|but health investment ?

Many of us will think that there is only one life to live. Eating whatever you want will give you temporary happiness but it's not good for your health. It's nothing wrong to think that you should live your life happily and enjoy the different foods. But at the same time you should not spare your health for just temporary happiness like enjoying junks. We would have heard about health insurance. But what is health investment..?