As a further elaboration: growing up, I absolutely hated pasta salad. I could not and would not eat it. But one day, when I was about 22-23, I was working somewhere that includes meals, since shifts were literally all day for a week (save eight hours for sleeping). The cook made a pasta salad that I could only describe as “orgasmic.” I ate that same pasta salad for every meal for the next two days until they finally tossed the leftovers. Ever since then, I have been “converted” to enjoy pasta salad. That one dish completely changed how my body reacts to a food that I already tried several times.
Other way round. I had the “fish” in the student cafeteria, fell totally sick for a few days (in hindsight, I should have gone to the hospital!), and since then, the smell of fish or sea food makes me sick.