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It sounds funny in a way but if you stop to think people who feed themselves in a bad way are likely to die from some disease related to their dietary choices or they will have kids who aren't really healthy after all. Could it be a new form of natural selection in which in place of it going through the natural dangers that nature and our environment can offer to us that are absolutely out of our control, we will be instead develop and survive through our conscious selections of way of life!?

yes, i believe it has been a mode of selection all along. now, though, we have more conscious choice. our diets are not so much controlled by our rulers or by nature. our rulers still try to control what we eat through propaganda, but with self education, that control is slipping away.