A child becomes an adult and later grows old. Body size, weight, and many constituents change, yet the person remains the same individual for ordinary understanding and moral responsibility. This does not prove that resurrection follows the same physical process as worldly development; it shows that personal identity need not require every temporary material component to remain unchanged.
Nutritional additions and other passing changes must be distinguished from the essential bodily identity of the one whose actions are judged.
Thus, the persistence of every component at every moment and the persistence of the same person are different propositions.