What will happen?

It is very strange to me, though seemingly not recognized as such until publicly or professionally revealed enough, that a simple law is often overlooked which is that any being has its own maximum capacity of storage. This is true for storage of information of any kind. Let us suppose that fully-described carriers of information form a being that is nicely organized as a life. What will happen to the being if the composition of information in the storage is intentionally modified so that an originally non-installed function is artificially gained? Since the storage is kind of Pareto-optimal, some of the originally installed information is overwritten by what is now being newly installed. Then the function expressed by the pre-installed information is lost in exchange for that expressed by the newly installed information. What will happen if the lost function is vital for a life to be as the life?