Adult with ARFID here.
It does often develop around 3/4 years old as thats one of the stages where kids start to become aware that food might be linked to digestive discomfort, they become more more aware of sensory differences, textures, and naturally averse to anything their brains tell them 'might poison/choke you' - but kids with ARFID have that dialled up to 11, it's gone overboard and its telling them a huge range of things are dangerous and not food and if they try to eat them they can't swallow, will retch, gag, vomit.. etc.
As everyone else has said, preferred, safe foods, tend to be those that are uniform, fairly plain, more likely to be dry than wet, and predictable.
Some of us are also 'super tasters' so what tastes bland to you tastes great to me, and what tastes nicely seasoned to you is horrifically salty/spicy/strong to me.
I can tell the difference in brands of frozen potato tots, by taste alone. I can tell when himself didn't rinse the dishes as I can taste the washing up liquid he can't taste. I know when we move to a new bag of potatoes as it tastes subtly different to the old bag.
I am marginally better as an adult as I choose what we buy, I have input into the prep and cooking and no ones going to yell at me or pinch my nose and force it down if I don't eat it.
And yet, I am now 3 years in to cycling through:
Quorn nuggets and airfryer potatos
Salad 'mulch' and quorn nuggets
Cashew nuts
Protein works shake
And that is basically it. Theres the odd raspberry or blueberry or nectarine but these are very variable and whilst a good one is delicious a bad one has me retching which I really don't enjoy.
- Don't pressure kids to eat - put it out, not touching, not on the same plate even, leave it be. No 'just try it' and no 'there see it WASN'T horrible' if they do.
- Offer a safe food every meal - you can put out other things too, but make sure the safe option is always there.
- Don't use food as bribery or punishment.
- Do model good cooking/food prep etc choices.
- Do not tell kids 'you've never tried it how do you know you don't like it' - their brain tells them its poison, its horrible, it will make them sick. They do not know why and cannot put that into words, but that is the truth for them.
- Do NOT doctor or hide other foods in safe foods. This does not expand the range of safe foods, it ruins trust in you, trust in the safe food and will almost certainly remove that safe food from the list! Similarly, hiding one brand of a product in the safe foods packaging is a shitty idea that will almost certainly fail (particularly if your kids a supertaster. We can tell!!)