Lemme tell ya.
I ate one bite of a burger. It tasted amazing. Then I put it down and said, "I can't eat this and I don't know why."
Everyone else ate. After dinner it was discovered there was mold in the buns. A few hours later, everyone else was barfing. No one who was there will eat something if I can't eat it.
Over Xmas, I ate a bite of fudge. I threw up immediately after- just a tiny bit, because it wasn't much food. Someone who wasn't there for the burger incident wouldn't listen to me, and ate an entire square of the fudge.
I had to go downstairs because he spent the night hurling, and I knew I wasn't a very sympathetic figure. He kept saying, "Throw it all away! I should never have eaten it! Whyyyy!"
I've been called "picky" and I say to them, the loss of not eating a thing because it gives me bad vibes is absolutely worth it every time it doesn't make someone sick, so I can avoid the one time it does.