By Michael McClennen, Research Informaticist, Department of Geoscience, UW-Madison, as posted on Quora website 13 May 2018;
The strongest argument against veganism is that it is not a natural diet for humans. We, along with our fellow apes, evolved to be omnivores. Chimpanzees eat meat whenever they can get it, and the gorillas and orangutans consume substantial quantities of insects and occasional bird eggs.
It is difficult for any human to maintain optimal heath without some animal food in our diet, and it is simply impossible for many people. To the few people who are able to do so, I say “good for you, but please don’t assume that what is possible for you is also possible for everybody else.”
In addition, eating a vegan diet does not mean that you are not harming any animals. A friend of mine who grew up on a farm told me that every time the combine harvesters cross a field they leave a trail of mice, rabbits, birds, and other small animals that have been literally chopped to bits by the harvester blades.
Crop farming also involves the deaths of many animals from poison, as well as causing the deaths of others by displacing the plants they would otherwise have eaten. It is utterly impossible to grow crops on a scale large enough to feed the human race without causing enormous disruption to the ecosystem and without directly causing animal deaths. This is a sad fact, but it is true.
Anybody who believes they are being morally superior by eating a vegan diet is simply fooling themselves.
Just Sayin'
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