It’s different to anorexia. ARFID isn’t common, but it’s based around revulsion / fear from tastes and textures. That one kid who will only eat toast and pasta and can’t manage anything else. Children usually have a very restricted list of foods they will eat and they have to be done a specific way (no overcooked pasta, pasta specific shape etc.)
It is a genuine issue. It’s like pickiness on steroids, and you manage it with a zero drama approach, feeding rhe child what they will eat and just everyone else eating what they do, and offering new things in a no fuss no drama way. You’ve had your pasta, yummy we are all having this delicious fruit crumble now, with ice cream! Fancy a bite?
You tend to find (as long as there’s no co morbid issues) that children eventually expand what they eat. They grow and eventually hunger cues help a bit.
Anorexia is more about control, they aren’t the same thing, although munchies do love claiming ARFID because it’s sooooper special and not their fault.