Before we can get to the land of science fiction we need to kill the idea that natural is by definition ‘good for you’ or ‘healthy’. It is simply not the case.
If you are a creationist and also a nature-is-good-ist then you hold an intellectually defensible position. It stands to reason that if a supreme being created the world some thousands of years ago and pronounced it good then that world would have a certain divine harmony. It stands to reason but it is not necessarily so since it also stands to reason that the motives of the creator will be forever unfathomable by the created. The creator could just as easily have made an un-harmonious creation and then give the job of bringing creation into harmony to some small part of that creation. It is hard to know without having a face-to-face with the supreme being.
If you are not a creationist but are a nature-is-good-ist then what are you thinking? There is no harmony between man and nature. Nature is chaos. Out of chaos, because of unusual circumstances and for a short time, there is intelligence. That intelligence is self-aware and seeks to use its advantage perpetuate itself for as long as it can before the lights go out. One of the things that that intelligence learned early is that almost everything in nature will eat it if it gets the chance. Early it learned to kill the large animals that were a danger. Later it learned how to kill the very small animals, I am speaking of bacteria, to keep them from killing it. Today that intelligence has learned how that the chaos of nature extends into its own bodies. Unless the blue-print of the bodies that carry that intelligence is perfectly balanced, pain and death comes not from without but from within. Even now the whole race of that intelligence is engaged in a titanic struggle to learn the perfect most optimized body blue-print so that future carriers to intelligence will live long pain free lives where death comes slowly if it comes at all.