We were allowed one fad at my junior school, and mine was meat fat. I still loathe it.
When I was about 4 my father tried to trick me into eating some, by concealing it in some potato, but once it got to the back of my throat I gagged. After that, they accepted it.
Apart from that, I was pretty unfussy, except for going off milk quite early on, and I’ve never liked cream.
My DPs were pretty fussy between them though - my DF wouldn’t touch milk, or anything that even looked as if it had milk in it!* And he didn’t like lamb - he called it dead sheep.
My mother was worse - no tomatoes or ‘eggy’ eggs, 😂, and she wasn’t keen on chicken ‘because it’s a bird’. Not that we had it very often at all - relatively expensive then.
*Even after. I was long grown up, my mother would ask me to ‘Get daddy out of the kitchen!’ so he wouldn’t see her putting milk in the Yorkshire pudding batter!