Is Natural selection looking out for us?

Source: 'Why we get Sick' book

Natural selection does not take long term well being of species in to account. Looking out for species would require 'group selection'. Example for 'group selection' is a bird choosing not to eat and thus opting for  death so that species survives. Basically the gene, actor in Natural selection cares for its well being not that of beholder. This implies that natural selection does not always result in healthy species. Richard Dawkins implies the same in his book 'Selfish Gene'.

According to this book Natural selection does not over engineer or go for perfection. We can see this in our spine. Back problem is like cough, everyone has it. According 'The aging spine' book our spine starts degenerating as early as 2nd decade.

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