Ick, I've never eaten and oyster, they look disgusting. I used to dig clams when I was a kid, but I wouldn't do that now. I wouldn't eat anything out of the sea, there are just too many contaminants. I remember going through the phase where I thought, "I just won't eat sentient creatures, mammals, birds, fish... but crustaceans and mollusks are lower life forms so they're ok". But then realized I don't like most of those foods, so what's the point? I just decided to go all vegetarian and eat no animals. Sounds like this author is conflicted about her reasons for being veg*n.
I get the comments about plants feeling pain all the time ("I heard a carrot cry the other day", just heard that one, forgot to post it on stupid-things...) I'm perfectly willing to entertain the idea that they have feelings. Certainly, if one wanted to kill me they would be justified. But I haven't read anything so far that is convincing, and I have to eat something, so for now I eat things with leaves but not things with fur.