Black coffee for me. Couldn’t stand it in my 20s, now I can’t start the day without it

Coffee. I didn't like the taste of it until I started drinking it out of necessity as a cheap caffeine delivery mechanism in college, and it grew on me. Now I couldn't live without it.

Onions. My mentally ill sibling loved eating onions when we were growing up, to the point where they would eat them 2-3 at a time like apples, and they reeked of this overpowering onion and body odor smell 24/7. It took me over a decade to get over that negative association and begin enjoying onions in food. Thankfully, nowadays I can finally appreciate why onions form the base of most good food dishes.

Spicy food. Both of my parents had extremely low spice tolerance, so I was never introduced to any level of spiciness beyond a few shakes of black pepper while I was younger. My idea of "spicy" was the salsa they gave you with the complimentary chips at a Mexican restaurant. I was finally convinced to try actual spicy food in my late 20s, and now I'm a huge fan of hot sauces and the medium-hot spice levels of things like Thai and Indian food. (I'm not a ghost pepper/carolina reaper fiend like some of the pain glutton spice fans out there, but I do enjoy 3-4 out of 5 on the spice level.)

Ironic that hot peppers developed their "hotness" to discourage animals from eating them.