Diets and exercises are good for damage prevention, when proven, sure. However, they are not damage repair toolkit or maintenance tool for the human body, nor c

Diets and exercises are good for damage prevention, when proven, sure. However, they are not damage repair toolkit or maintenance tool for the human body, nor could we replace our hearts, organs, and other damaged parts on demand, like a car mechanics. No matter how well you eat, it is inevitable that our parts will get worn out or starts malfunctioning in old age as a result of cumulative damage. (Yes, we do have artificial hearts, organs transplants, and so on but they have drawbacks until we improve them...)