Slavery and eating animals

[Faith No More]

I eat animals because I understand my own nature as an evolved organism that is an omnivore, with a physical requirement that I do so. Since morality must take into account the physical realities of the parties involved, there can be nothing immoral about eating animals because of this.

Doesn't that line of reasoning run into the natural fallacy, though? Because physically, you can survive without eating meat. It just takes extra work.

I think the whole debate boils down to what exactly can an animal feel, because morality must heavily take into account the experiences of those involved.