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

Cells don’t have “memory” or perhaps a better word is cognition. The way it replicates is from the “program” encoded from the prior generation. Cells have no sense of “this will work better if I reverted to an earlier model” because there is no “earlier model” stored somewhere. It only “knows” what it inherited.