1

When I was maybe 3 (I'm not sure how old I was) I nearly died from what is now known as norovirus. I couldn't keep anything down and got severely dehydrated.

The "cure" was for me to spend three days in the hospital on intravenous fluids. Without that, I would have been dead.

2 Yeah, three of the biggest life-savers are public sanitation, medical hygiene, and keeping sick kids properly hydrated.

3

They gave me 7-up to drink at the hospital. And after that, whenever we got sick with "stomach flu", my parents bought 7-up for us. That was the only time we ever had it.

To this day I cannot stand the stuff. A triumph of conditioning, eh?

4

Similar story, but I was 5 or 6, and dunno what virus it was.

I had read somewhere that foods consumed during periods of serious childhood illness become marked in our 'write-once memory' as toxic or poisonous... it's an evolutionary advantage to have hard-coded "don't eat this again" signals when you're a hunter-gatherer omnivore trying different foods.  Nowadays, it just means we wind up with people who can't stand 7-up, or beets, or whatever else got fed to us back then.

5 For me, it's the Shamrock Shake from McDonalds.  Had such a terrible case of chickenpox that it was not only all over my skin, but in my mouth and down my throat!  The doc said things like ice cream.  On the day I felt the worst, Momzerduck provided me with a Shamrock Shake.

Never again.  It's been... oh, 32 years since I had one.

6 That's quite possibly the saddest food imaginable to be unable to eat, Wonderduck.