Oops, I keep forgetting that one of my household sims is vegetarian. I wish the warnings were a bit clearer because he just goes ahead and eats stuff then gets the bad moodlets about it.
I always feel bad when I do that by mistake because I'm a vegetarian and I'd hate somebody forcing me to eat non-veggie meals. Well, unless it happens to be a vegetarian sim I hate, then I do it on purpose. :D