You only receive one body without replacement parts being guaranteed.

There is one body and the repairs available are partial, uncertain, and always worse than the original. Some things heal well, many do not, and the parts that wear out are not reliably replaceable regardless of what medicine can currently do. That is not a reason for fear, only for a certain care.

Pick the thing you are most casually risking and stop. Not everything, one thing. Long-term care of something irreplaceable rarely feels urgent and is rarely regretted.