There is such a thing as excessive concern with the body's health and excessive fear of its destruction. The body is to be used -- and used up. It is your vehicle here below; it is not you. It is an experience mill, so grind away. If thinking raises blood pressure, am I going to give up thinking? If reading weakens eyesight, will I give up reading? Physical health is a means, not an ultimate end. A healthy body aids the working out of my intellectual and spiritual salvation. But the point is to work out my intellectual and spiritual salvation.
Analogy. One takes good care of one's writing implements. But the point is to write something. The pencil achieves its end -- in both senses of the term -- by being used and used up. Similarly with the body and its organs.
So use the body, and use it up. You can't take it with you. But don't misuse it. Use it or lose it, but don't abuse it!