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Addendum: Piaget did some very interesting multigeneration studies with freshwater snails that showed that some environmental conditions cause adaptations in later generations, even if the environmental condition is no longer present. These are not mutations. They are sections of a species' genetic code that is "switched on" and that parameter is passed to offspring somehow, probably in extra-nucleic RNA or hormones or some other trigger mechanism. My point here is that there is some evidence that dietary patterns may persist in a similar way. It's not that these things can't be changed by an individual, but it may not be fair to assume that the effort required of each individual is comparable for the same degree of change.
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