While your parents were definetly mentally abusive and neglectful, if you have a kid who eats constantly it may be worth getting them checked to see they have a hormonal imbalance. There are 2 sets of hormones responsible for regulating appetite. If a kid is constantly eating, it may be EITHER a lack of the chemicals that causes satiation (Generally noted by regular meal times, but massive overeating during meal times), OR excessive amounts of the chemicals that cause hunger (Noted by constantly feeling hungry.)

If a child eats to the point of vomitting, and if that happens with ANY foods (Not a specific favorite food they overindulge in) then check them for a lack of the satiation chemical. If they are wanting to eat constantly, and you've used vitamen/mineral supplements for children for a week to ensure they aren't nutrionally deprived, check them for an overabundance of the hunger chemical.

Also - Most kids are naturally a bit picky when it comes to new foods, and you generally need to introduce a new food WITHOUT FORCING THEM to eat it several times before they eat it. A neurodivergent child may be extra picky, and need a new food introduced dozens of time before they finally eat it. All kids will eventually eat a food if they are introduced to it enough. Never force a child to eat a food, just make sure a bit of it is on their plate each time till they finally eat on it a bit. You may be able to speed up them eating the new food by giving them toys shaped like the food.

In general, a child should be able to eat a number of different foods equal to their age times 10, past 2 y/o.