Well, given that rats who live in the human "unnatural environment" do a lot better than rats in the wild, that's not really true. (Unless you define "wanting to survive" as a "compulsion.")Living in unnatural environment is usually not natural. That is usually due to some ease, compulsion or greed. Should not be real health interest.
Sounds like you believe in the "noble savage" myth - that being in a 'natural' state is superior, and organisms that live that way are healthier, happier, longer lived etc. Again, it would help you to get out into the real world and see how nature treats animals. (Hint - it is not "altruistic" or "friendly" or "giving.")