Onions. I would painstakingly root out, sift, pick out every fragment of onion matter from the food to avoid eating them, even the tiny diced bits in a meatloaf.
Love them now; cooked or raw.
Me, too! I dunno but maybe the exotic-ness of tornados made them seem especially scary. OTOH, earthquakes never scared me as a kid, but now? I’m old, and at the first hint of an earth quiver, and I’m thinking “Is this the Big One?”
I had walleye when I was visiting friends in the Detroit area a while back, and I didn’t care for it at all. I’ve come to find I much prefer salt water fish to fresh water fish.
As long as you hold the red onion and mustard I’m in complete agreement. 
Mayo and extra sharp cheddar for me please. With extra extra liverwurst.
Needs some real butter and possibly some horseradish cheddar cheese, but yes to lots of liverwurst. And maybe a defibrillator on standby would be a good idea.
Still not into classical music tho I’ve found if you listen to the same piece often enough the familiarity will make it grow on you. I say this having worked tech for various concert venues.
I was a die-hard rock & roller. I HATED jazz. Sounded like random notes and discord. It wasn’t 4/4 time. I couldn’t even discern a beat. But I had a college roommate who was really into it. One night Thelonious Monk was playing on the stereo while I was trying to ignore it, doing something in another room. The music was barely on the periphery of my consciousness. For some reason, at that moment the subtlety of the music hit me. I GOT it. Been a Monk fan and a fan of most jazz ever since.
Period-set TV dramas, especially murder mysteries. Boring when I was a kid, but now just my cup of tea.
Winter… If it’s hot, I’m screwed. I can take off all my clothes and still be hot, and not able to sleep… But in Winter, one can dress warmly, and I do have a furnace, but even in Michigan, I tried to use my space heater as much as possible, since I’m only in one space. But the MAIN reasons are the reduction of noise pollution of my neighbors and their dogs and dogs.
I used to think going on a nature hike was pretty tedious as a kid, but I enjoy them now.
Right there with you. I picked them off of every McDonald’s hamburger. Couldn’t stand them in potato salad or meatloaf or anything really.
Now, I regularly make French Onion Soup. I couldn’t imagine a hamburger without grilled onions. I make NY-style onion sauce for my Boar’s Head hot dogs. And thinly-sliced raw ones on a sandwich are divine.
I also though anything with liver was of the devil. Then I was invited to a seder a few years ago that was catered by Canter’s in LA. The chopped liver was insanely, plate-licking good. Still don’t think I would order a slab of it, but in that particular form, it was wonderful.
Yeah, my taste buds have definitely changed.
That’s funny, because you jogged my memory. As a kid, liver was one of those foods that while I didn’t hate it, but generally disliked it and ate it only in small amounts. Now I really like it, only I have to eat it rarely because of its off-the-scale high cholesterol content. ( though it’s very rich in other nutrients )
Same for me, and now I don’t really know why they obsessed me.
I’m surprised nobody’s mentioned beer yet. My first was one of two cans that had fallen from a loading dock and rolled into a corner of the back lot behind a supermarket. I might have been 10 years old. My friend and I took them home, arranged a sleep over and drank them in the basement of my parents’ house. They were warm and tasted terrible, although we both pretended to like it, ha-ha. I didn’t develop a taste for beer until I was 17 or 18.
Ah wow!
Grandpa used to try to get me to eat braunschweiger sammiches as a kid🤮
Put a little slice of cheddar on that and either wheat or rye bread of some variety and heck yeah 
Yeah braunschweiger, onion, mustard, and wheat and rye bread, hated all of those as a kid and now they’re all staples at my house(well not the braunschweiger, but it could be)
Going the other way, used to love asparagus as a kid(we grew our own under a leaky water bib) but now, I’ll pass thank you.
Olives.
This is going to sound made-up, but I swear to Beevis it’s true.
I despised olives my entire life. I used so say, “I don’t even like people who like olives”.
Then, one day on my way to buy some stuff from a local, gourmet-ish market, I instantly and randomly craved olives. And I knew, I knew, that I now liked them.
So I bought some big’uns, stuffed with little hunks of bleu cheese. And I was right. They were delicious.
mmm
Accounting. Until I went to school to become an accountant and actually learn everything involved with accounting, I thought it sounded like the absolute most boring thing imaginable. In fairness, a lot of the grunt work still is, but that’s mostly automated now. How did I get to go to school for it if I hated it? I went to a business school and told them I wanted to join their hardest program. Going in I assumed it would be finance, but they said accounting. I went along with it because I didn’t have any other career option available and I felt earning a difficult degree would put me in the best position.
Another vote for mushrooms here. As a kid, the smell of them frying would literally make me retch. Now, I can’t have them too often. And as a subset of this, for some reason mushroom soup, which I avoided long after I converted to a mushroom fan. But these days (at last) when I ask in a restaurant “What’s the soup?” I’m wishing real hard that it’s mushroom.
Reading this thread, what strikes me is how many of the mentioned foods I just wasn’t exposed to/had no access to as a kid. Considering vegetables alone: broccoli; avocado; sweet potatoes; asparagus; spinach; red onion; olives; horseradish. I guess part of it is the traditional British suspicion when it comes to foreign foods (take that, broccoli!); and partly, living in the unsophisticated (and how!) distant north west of England.
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It’s weird to me that these are considered exotic, but I was born and raised in California, so I’ve always had access to a fairly vast array of produce. My mom moved to California (from Ohio) as an adult, and there were a ton of foods she ate for the first time when she moved here. Her avocado story is legend in the family: she picked a nice firm one like she’d pick the vegetables she was used to. She hated it.
Yep. I still do not care for it overcooked. Raw is best or lightly steamed. I still do not care for spinach all by itself.
I also didnt like mushrooms.
I still hate them, even the stench.
This is how my Mother fixed all her “greens”, so Dad and I ate salads.
They have massively improved the taste of diet sodas since I was a kid.
Raw onions dont love me, sadly.
I think adding better tasting varieties is the key. Diet Coke is terrible and I think Diet Pepsi is the worst thing out there.
They have a loyal base, so they don’t want to change the main brand. The new ones are much, much better.
To my mind, whether kid or adult, there is literally nothing in common between cooked liver served as an entrée (e.g. the classic liver & onions), and any sort of chopped liver, braunschweiger, etc. The former was, is, and shall always be ghastly. The latter, wonderful.
Well there’s your problem right there. Warm canned beer tastes awful even now as an adult. Cold is much better. 
Although I agree that as a kid trying a swig of even cold beer wasn’t real exciting. Yet.
My parents didn’t let us grow too much of a sweet tooth as kids go, but beer really didn’t have much redeeming flavor. The fact I was probably 14 before I ever had a big enough dose to get a buzz probably had something to do with not caring for it before. Even now NA beer seems kinda pointless.
Yep. That’s another one. Hated it as a kid. Lightly sipped it at parties to be social but disliked it. Then I took up volunteering at races. Had a long, hot, busy day and at the end of it I actually craved a beer. Oddly, I still don’t care for the taste of most of it but it is somehow sooo satisfying to drink.