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Well, then why is everyone worried about what we eat now? Our bodies should just evolve to better handle the Big Macs, large fries and giant chocolate shakes.

The problem is that medical science is preventing that step in human evolution. If they keep on doing heart bypass operations to save people, then the genetic superiority of those who can survive "Super Sizing" their fast food meals cannot be exploited. However, if Hitlery takes over the country's medical system and drives it into the ground, people will no longer be able to survive their heart attacks.

Please look for my book "All I really needed to know about eugenics, I learned at McDonalds" coming to bookstores and drive-thrus near you.

Surviving "Super Sizing" is not the solution. If "Super Sizing" gives a portion of the population a reproductive advantage, then it is a good thing in terms of natural selection. The older proportions of the population are, by-and-large, not the reproducers or the child-rearing portion of the population. As such, the older portion is useful to a community to the extent they can guide, educate, and assist the younger portion. Otherwise, they would simply be a drag on the available resources.

Note, many of the diseases related to a the typical poor American diet tend to show up in older people - coronary heart disease, hypertension, loss of teeth, osteoporosis, etc. Diseases due to malnutrtion tend to strike the yougest members of a population. Malnutrition is a leading cause of death in the third world. Diet and the availability of food has been an important factor in the development of modern human history (since the time of the first pasoralists).

Modern medicine and the availability of a steady food supply has lengthened the human life span. I am making no judgement whether that is a good or bad thing. To the extent that we can adapt to the less healthy parts of our diet through our prime reproductive years, the selection process is working properly.

"Well, then why is everyone worried about what we eat now? Our bodies should just evolve to better handle the Big Macs, large fries and giant chocolate shakes."

"The problem is that medical science is preventing that step in human evolution. If they keep on doing heart bypass operations to save people, then the genetic superiority of those who can survive "Super Sizing" their fast food meals cannot be exploited. However, if Hitlery takes over the country's medical system and drives it into the ground, people will no longer be able to survive their heart attacks."

Evolution continues as always...and may have even acellerated(sp).

My theory:
If, as has been claimed, that our bodies are now contaminated with drugs, alcohol, nicotine, fats and etc., the sperm and eggs of future humans that cannot cope with these 'pollutants' very simply do not conceive. Females have many unknown abortions through-out their lives and all the 'problems' of modern society are comprehended in this process. Only those that can tolerate present day conditions even make it to being conceived. The high cholestoral and heart attacks are just a minor player in this scenario.