Vegan reply to the excuse "But it is natural to consume meat and other animal foods"`
Some try to justify things because "God says". Some try to justify things because "Nature says"/”Our bodies says’. But if something is moral because it occurs in nature, or because we have the biological capacity to do a certain thing, then rape and cannibalism is also moral.
We humans have the biological capacity to use violence and murder. This doesn’t make it morally justified. We humans have the biological capacity to harm, kill and eat humans for food and we can try to justify it by claiming that we are getting “nutrition”. This doesn’t make it morally justified.
But we are able to. We have the capacity. But again, biological capacity doesn’t constitute as a moral justification. If it did, then it would also be moral to harm, kill and eat humans. Our anatomy is not our ‘God’. To say ‘Eating meat is justified because my God says it is justified’ is analogous to saying ‘Eating meat is justified because my Body says it is justified’.. And then we have the biological capacity of harming, and killing and eating animals. The science is clear that it is detrimental to our health, see e.g. research that I gathered here [1 ]
We can live and thrive on a vegan diet, so killing and harming animals for food in our society is completely unnecessary. The only "justification" is that it tastes good/convenience -- and pleasure is no moral justification for hurting and killing an animal. I recommend you to study this article : http://articles.philly.com/2009-08-14/news/24986151_1_atlanta-falcons-quarterback-vick-illegal-dog-dog-fights and http://www.eatlikeyoucarebook.com/
You cannot draw anything normative from that. That is, to say that can consume X does not mean we ought to consume X or that it is morally acceptable to consume X.
Counter-claim about veganism: http://www.ecologos.org/mcardle.htm