I’d also point out that there have been some interesting reports on news programs regarding plants “feeling” in some mysterious sense. I’d suspect that part of the problem with Vegans is that they greatly oversimplify the complexity and diversity of plant and animal life on the planet. They have what could be called a linear way of looking and analyzing information–usually to support their positions, which are positions which strangely resemble religious convictions. Although it’s been a while since I studied the heresy of Manichaeism (which Saint Augustine opposed and battled in his writings), there also seem some to be some similarities in regards to the dietary restrictions of these heretics and the beliefs of Vegans. As such, it would not seem possible for a well-informed Catholic to hold Vegan convictions.
Here is a good passage to read from Acts Chapter 10.
**9About noon the following day as they were on their journey and approaching the city, Peter went up on the roof to pray.
10He became hungry and wanted something to eat, and while the meal was being prepared, he fell into a trance.
11He saw heaven opened and something like a large sheet being let down to earth by its four corners.
12It contained all kinds of four-footed animals, as well as reptiles of the earth and birds of the air.
13Then a voice told him, “Get up, Peter. Kill and eat.”
14"Surely not, Lord!" Peter replied. “I have never eaten anything impure or unclean.”
15The voice spoke to him a second time, “Do not call anything impure that God has made clean.”**
In short, in order to be truly consistent and honest, it seems that the logical approach for Vegans is to stop eating altogether.