Do you really lose your appetite when someone says something gross?

I've heard so many people say "I just lost my appetite" when hearing gross things. If I'm hungry, that appetite stays. Wish I could lost it, maybe I'd lose weight. hahah

I am sensitive to that stuff, but who wants to hear about poop when you are eating. For me it depends on what the people say or what I see on the tube. If it is something really gross like blood then I get a funny feeling in my stomach and can't eat for at least 10 mins.