If the cells in our body are replaced every 7 to 10 years, why cant it roll itself back into a position where it worked better than it does now?

Question

For example: Someone has a disease, why cant the body just reset itself to how it was before it had the disease to get rid of the negative effects?

In: Biology

Answer 1

New cells are made from old cells. If the old cells have a problem, the new cells will usually have that problem too.