The next step is to seek out and consume the substances that are used to build new cells to replace the worn-out.
A key part of that process is to eat a significantly varied diet so that the body has a chance to absorb all the minerals needed. If you understand plants, you can appreciate that plant A is richer in substance P {or L or G or whatever) than another plant type.
A classic example is that asparagus, turnips, parsnips, celery, and Min-Col are rich in the much-needed arsenic for the heart. Other plants are richer in different minerals and the varied diet helps us mine them out if our digestive juices are strong (proper pH).
But what do you do when the plants are so devoid of minerals that you can't get what is needed from your diet?
Supplement, of course. RBTI has a focus on Min-Col plus Algavim for average cases with special supplements in some cases, mainly to get the calciums high enough.
If you understand all that, you may love this video that shows elephants mining underground for minerals because the vegetation they get is from leached out soil.
https://youtu.be/7OcZmSJ6Ajk